Titiler-pgstac

* add python 3.10 and 3.11 support
* update to rio-tiler 4.1
* add `/{searchid}/map` endpoint to the `MosaicTilerFactory` (added when `add_map_viewer` is set to `True`)
* add `/{searchid}/WMTSCapabilities.xml` OGC WMTS endpoint to the `MosaicTilerFactory`
* add `/list` to the `MosaicTilerFactory` to list available mosaics (added when `add_mosaic_list` is set to `True`)

**breaking changes**

* remove python 3.7 support
* update titiler requirement to `>=0.10.0`
* replace `connection_string` by `database_url` in `settings.PostgresSettings`. We can now directly set `DATABASE_URL` environment variable.

Frontend changes

- remove `asset_expression` (Mosaic and Item)
- histogram band names are prefixed with `b` (e.g `b1`) (Mosaic and Item) (ref: https://github.com/cogeotiff/rio-tiler/blob/main/docs/src/v4_migration.md#band-names)
- expression for STAC have to be in form of `{asset}_b{band_name}` (e.g `red_b1/green_b1`) (Mosaic and Item) (ref: https://github.com/cogeotiff/rio-tiler/blob/main/docs/src/v4_migration.md#multibasereader-expressions)
- added `asset_as_band` option to force expression to be in form of `{asset}` (e.g `red/green`) (Mosaic and Item)
- expression's band should now be delimited with `;` (previously `,` was accepted) (Mosaic and Item)
- point output model to include band_names (Item)
- added `algorithm` options

* update `titiler.core` and `titiler.mosaic` requirement to `0.7`
* add `MosaicTilerFactory._tilejson_routes` method to register `TileJSON` routes
* raise `cogeo_mosaic.errors.MosaicNotFoundError` when SearchId is not found in *pgstac.searches* table

**breaking changes**

* move version definition in `titiler.pgstac.__version__`
* remove unused `fetch_options` in `titiler.pgstac.reader.PgSTACReader`

* update `titiler` version and add `reader_dependency` and `backend_dependency` in endpoint factory.

* remove LRU cache on all settings classes to enable support for manually providing settings via keyword arguments and to minimize lines of code (author alukach, https://github.com/stac-utils/titiler-pgstac/pull/54)

* Insert mosaic metadata `min/max zoom` and `bounds` in tilejson (https://github.com/stac-utils/titiler-pgstac/pull/51)
* allow users the ability to optionally provide `PostgresSettings` to `connect_to_db()` function in the event that they want to customize how their DB credentials are populated (author alukach, https://github.com/stac-utils/titiler-pgstac/pull/53)

* add `feature()` method to `PGSTACBackend` mosaic backend
* add `/statistics` endpoint to return statistics given a GeoJSON feature or featureCollection
* add `collection` in allowed returned fields
* switch to `pgstac.search` to get the STAC Item in `titiler.pgstac.dependencies.get_stac_item` (https://github.com/stac-utils/titiler-pgstac/pull/50)