chore: Add support for Python 3.10, 3.11, 3.12 and drop 3.7

[Dosenpfand]

Description

Add support for actively maintained Python versions and drop support for unmaintained versions.
Among many advantages, this makes it possible to update dependencies to recent versions, that do not have security vulnerabilities, see #2136 .

Includes

1. Add Python 3.10, 3.11, and 3.12 builds to and remove 3.7 from ci.yml.
2. Switch from nosetests to nose2 (a maintained version that supports recent Python versions) and adapt tests and invocation calls accordingly.
3. Switch to the most recent black version and format everything with it (needed to work with recent click versions.)
4. In setup.py pin flask and werkzeug to lower versions for compatibility.
5. Update requirements.txt via pip-compile.
6. Bump pyodbc and python-ldap versions in requirements-extra.txt.
7. Update the mongo dependencies in requirements-mongodb.txt to the most recent versions.

ADDITIONAL INFORMATION

• Has associated issue:
• Is CRUD MVC related.
• Is Auth, RBAC security related.
• Changes the security db schema.
• Introduces new feature
• Removes existing feature

[codecov]

Codecov Report

Merging #2147 (16ac0c2) into master (3cfe13f) will increase coverage by 0.76%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master    #2147      +/-   ##
==========================================
+ Coverage   78.55%   79.31%   +0.76%     
==========================================
  Files          72       72              
  Lines        8695     8970     +275     
==========================================
+ Hits         6830     7115     +285     
+ Misses       1865     1855      -10     

Flag	Coverage Δ
python	79.31% <33.33%> (+0.76%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
flask_appbuilder/_compat.py	70.58% <ø> (ø)
flask_appbuilder/actions.py	93.75% <ø> (ø)
flask_appbuilder/api/manager.py	92.45% <ø> (ø)
flask_appbuilder/babel/manager.py	95.45% <ø> (ø)
flask_appbuilder/basemanager.py	100.00% <ø> (ø)
flask_appbuilder/baseviews.py	90.89% <ø> (+1.17%)	⬆️
flask_appbuilder/charts/jsontools.py	100.00% <ø> (ø)
flask_appbuilder/charts/views.py	93.87% <ø> (+0.69%)	⬆️
flask_appbuilder/filemanager.py	25.16% <ø> (ø)
flask_appbuilder/filters.py	90.99% <ø> (ø)
... and 24 more

... and 9 files with indirect coverage changes

[dpgaspar]

This is great!!

[dpgaspar]

nice, thank you for adding these "stops" and comments