Octodns

* Fix env var type handling that was previously fixed in 1.5.1 and then
regressed in 1.6.0.

* Add EnsureTrailingDots processor
* Beta support for custom secret providers added to Manager.

* Improved env variable to parameter type conversion logic, avoid converting
all numbers to float which caused some formatting issues in things that
weren't being careful enough.

* Beta support for Manager.enable_checksum and octodns-sync --checksum Allows a
safer plan & apply workflow where the apply only moves forward if the apply
phase plan exactly matches the previous round's planning.
* Fix for bug in MetaProcessor _up_to_date check that was failing when there was
a plan with a single change type with a single value, e.g. CNAME.
* Support added for config env variable expansion on nested levels, not just
top-level provider/processor keys
* _ChunkedValue ASCII validation added, SPF & TXT
* Re-work value/values handling to always try and do the "right" thing based on
the content, so both singular values and lists will be handled identically
regardless of whether the key is value or values. This may result in
changes/fixes on the first sync after updating IFF you currently have
`values: a-single-thing`, which would have previously been pushed up as bunch
of single character values.
* Record.octodns added to formally make that data "API" and Record._octodns is
deprecated. The latter has been converted to properties that return the
former and emit deprecation warnings.

* Record.lenient property added similar to other common/standard _octodns data
* Processor.process_source_and_target_zones added to support modifying both the
desired and/or existing zones just prior to computing changes.
* Fix bug with Record.copy when values is an empty list []
* Fix an issue in MetaProcessor/Manager.include_meta where include_provider
wasn't correctly taking effect

Noteworthy changes

* Added `octodns.__version__` to replace `octodns.__VERSION__` as the former is
more of a standard, per pep-8. `__VERSION__` is deprecated and will go away
in 2.x
* Fixed issues with handling of chunking large TXT values for providers that use
the in-built `rrs` method
* Removed code that included sha in module version number when installing from
repo as it caused problems with non-binary installs.
* Fixed a bug/shortcoming in Record.data where it didn't include the `octodns`
portion of the record's data. Record.copy also omitted it since it relies on
.data for the heavy lifting. There are no known actual problems due to this
bug, but it's possible (non-public) third party providers are susceptible. The
most likely place to hit issues in is tests where data and/or copy are abused.

Stuff

* Added ZoneNameFilter processor to enable ignoring/alerting on type-os like
octodns.com.octodns.com
* NetworkValueAllowlistFilter/NetworkValueRejectlistFilter added to
processors.filter to enable filtering A/AAAA records based on value. Can be
useful if you have records with non-routable values in an internal copy of a
zone, but want to exclude them when pushing the same zone publically (split
horizon)
* ExcludeRootNsChanges processor that will error (or warn) if plan includes a
change to root NS records
* Include the octodns special section info in `Record.__repr__`, makes it easier
to debug things with providers that have special functionality configured
there.
* Most processor.filter processors now support an include_target flag that can
be set to False to leave the target zone data untouched, thus remove any
existing filtered records. Default behavior is unchanged and filtered records
will be completely invisible to octoDNS