Let Flask-Session be installed with optional dependencies.

The possible optional groups are cachelib, filesystem,  mongodb, redis, sqlalchemy and dev.
`Flask-Session[dev]` installs all optional-dependencies.

pyproject.toml

@@ -25,6 +25,14 @@ dependencies = [
 ]
 dynamic = ["version"]
 
+[project.optional-dependencies]
+cachelib = ["cachelib>=0.10.2"]
+filesystem = ["cachelib>=0.10.2"]
+mongodb = ["pymongo>=4.6.2"]
+redis = ["redis>=5.0.3"]
+sqlalchemy = ["flask-sqlalchemy>=3.0.5"]
+dev = ["Flask-Session[cachelib, filesystem,  mongodb, redis, sqlalchemy]"]
+
 [project.urls]
 Documentation = "https://flask-session.readthedocs.io"
 Changes = "https://flask-session.readthedocs.io/changes.html"

src/flask_session/__init__.py

@@ -1,6 +1,6 @@
 from .defaults import Defaults
 
-__version__ = "0.7.0"
+__version__ = "0.8.0"
 
 
 class Session: