Bcdata

* Code in `.onLoad()` that sent a request to the wfs getCapabilities endpoint
could cause the package to fail to load. This was moved into an internal
function `bcdc_get_capabilities()` that makes the request the first time it's
required, and stores the result for the remainder of the session (271)
* testthat is now used conditionally to only run tests if the testthat package
is installed.

IMPROVEMENTS
- Setting the `bcdata.single_download_limit` limit dynamically from the
getCapabilities endpoint. 256
- `bcdc_describe_feature` now joins an object description column to the returned
object to provide more information about a field directly in R. 241, 259
- Better documentation and information surrounding the
`bcdata.max_geom_pred_size` option. 243, 258
- Add new function `bcdc_check_geom_size` so users can check prior to submitting
a WFS request with `filter` to see if the request will require a bounding box
conversion. 243, 258
- Better documentation and messaging about when and why paginated requests are
required by `bcdc_query_geodata()`. 240, 264
- Better documentation and print method for what records are suitable for use
with `bcdc_query_geodata()`. 265, 267

IMPROVEMENTS
* Added `bcdc_list_groups` and `bcdc_list_group_records` to provide the ability
to query on the group endpoint of the catalogue API. 234
* Added new option `bcdata.single_download_limit` to enable setting the maximum
number of records an object can be before forcing a paginated download (252)

BUG FIXES
* Fixed bug in `collect.bcdc_promise` where the wrong parameter name in
`crul::Paginator$new()` resulted in an error in paginated wfs requests (250,
thanks meztez)
* Fixed a bug where the name of `bcdata.chunk_limit` option had a typo, so that
it was not actually used properly (252)

BUG FIXES
* Remove link for pipe documentation for simplicity.
* Fixed bug where using many `as.` functions (e.g., `as.Date()`,
`as.character()`, `as.numeric()`) in a filter statement would fail. (218,
219)

MAINTENANCE
* Updated internal SQL translation to use `DBI` S4 generics
(`DBI::dbQuoteIdentifier()` is now used instead of
`dbplyr::sql_escape_ident()` and `DBI::dbQuoteString()` instead of
`dbplyr::sql_escape_string()`), to comply with upcoming `dbplyr` 2.0 release
(225, 225; https://github.com/tidyverse/dbplyr/issues/385)
* Wrapped all examples that call web resources in `try()` to avoid spurious
check failures (229).

BREAKING CHANGES
* Rename `selectable` column from `bcdc_describe_feature` to `sticky` and modify
corresponding docs and tests (180).

IMPROVEMENTS
* Add explore-silviculture-data-using-bcdata vignette/article. h/t hgriesbauer
* Add `head` and `tail` methods for `bcdc.promise` objects. Thanks to
hgriesbauer for the suggestion! (182, 186)
* Provide `as_tibble` as an alias for `collect` in line with `dbplyr` behaviour
(166)
* Geometry predicates can now take a `bbox` object as well as an `sf*` object
(176)
* When reading in excel files, `bcdc_get_data` now outputs a messages indicating
the presence and names of any sheets (190)
* `bcdc_get_data()` & `bcdc_query_geodata()` will now work with full B.C. data
catalogue url including resource (125, 196)
* `bcdc_sf` objects now have an `time_downloaded` attribute
* Authorized B.C. Data Catalogue editors can now authenticate with the catalogue
by setting a `BCDC_KEY` environment variable with their catalogue API token
(https://github.com/bcgov/bcdata#bcdc-authentication; 208).

BUG FIXES
* Fix `select`, `filter` and `mutate` roxygen so that bcdata specific
documentation to these methods is available
* Add tests for attributes

IMPROVEMENTS
* Add `bcdc_tidy_resources` for retrieving a data frame containing the metadata
for all resources from a single B.C. Data Catalogue record (PR149, 147)
* Add a more decorative record print method (73)
* More reliable detection of layer name for a wfs call in `bcdc_query_geodata()`
(129, 138, 139)
* Add `mutate` method for bcdc_promise that only fails and suggest an
alternative approach. (PR134)
* Add back in querying vignette
* Using `tidyselect` so that `select.bcdc_promise` behaviour is typical of
`dplyr::select` ($140, 138)
* Using GitHub actions for CI.

MINOR BREAKING CHANGES
* Remove `BEYOND()` and `RELATE()` geometry predicates as they are currently not
fully supported by geoserver

BUG FIXES
* Now precompiling vignettes so that queries are submitted locally and no
actually requests are made from CRAN (151)
* Fix `NOTE: Namespace in Imports field not imported from: ‘methods’` error on
CRAN (145)
* Fixed a bug where functions nested inside geometry predicates were not
evaluated (146, 154)
* Fixed a bug where `DWITHIN` wasn't working because `units` needed to be
unquoted (154)
* Fixed a bug where `BBOX()` used in a `filter()` statement combined with
`bcdc_query_geodata()` did not work (135, 137, 131)
* Fixed a bug where layer names with a number in them would not work in
`bcdc_query_geodata()` (126, 127)