Re-implement c version immutabledict / processors / resultproxy / utils with cython.
Performance is in general in par or better than the c version
Added a collection module that has cython version of OrderedSet and IdentitySet

Added a new test/perf file to compare the implementations.
Run ``python test/perf/compiled_extensions.py all`` to execute the comparison test.

See results here: https://docs.google.com/document/d/1nOcDGojHRtXEkuy4vNXcW_XOJd9gqKhSeALGG3kYr6A/edit?usp=sharing

Fixes: #7256
Change-Id: I2930ef1894b5048210384728118e586e813f6a76
Signed-off-by: Federico Caselli <cfederico87@gmail.com>

Change-Id: Ib2da811acbad291dc9bbe798c84f2309f5d0f21e

Change-Id: I0124bb1bb164fbf2eadf41be066773a2e316b3fe

<!-- Provide a general summary of your proposed changes in the Title field above -->

### Description
<!-- Describe your changes in detail -->

Python 3.10 was released last week.

Test on Python 3.10 and add the Trove classifier.

### Checklist
<!-- go over following points. check them with an `x` if they do apply, (they turn into clickable checkboxes once the PR is submitted, so no need to do everything at once)

-->

This pull request is:

- [ ] A documentation / typographical error fix
	- Good to go, no issue or tests are needed
- [x] A short code fix
	- please include the issue number, and create an issue if none exists, which
	  must include a complete example of the issue.  one line code fixes without an
	  issue and demonstration will not be accepted.
	- Please include: `Fixes: #<issue number>` in the commit message
	- please include tests.   one line code fixes without tests will not be accepted.
- [ ] A new feature implementation
	- please include the issue number, and create an issue if none exists, which must
	  include a complete example of how the feature would look.
	- Please include: `Fixes: #<issue number>` in the commit message
	- please include tests.

**Have a nice day!**

^ Which checklist option should I use?

Should I do something to trigger/test all the workflows?

Closes: #7179
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/7179
Pull-request-sha: 5df7ff0e0d309301a877314e620fadb6f3f570cb

Change-Id: Ib7ecc0de75f7dffdf05db13563f7be10898e67ba

Change-Id: Ib7ccde2fbcaefe80859941e5e46bebf4fe4ea689

- use manylinux1 for python 2 since manylinux2010 has dropped
  support for it
- use a different action to upload the artifacts to the release so
  that a single step can be used
- also generate manylinux2014 wheels for python3

Change-Id: Ibc1cc31737a90c40afc7988308c58b471d2fec2f

* remove the c version of distill params since it's actually slower than
the python one
* add a function to langhelpers to check if the cextensions are active
* minor cleanup to the OrderedSet implementation

Change-Id: Iec3d0c3f0f42cdf51f802aaca342ba37b8783b85

Avoid passing LD_LIBRARY_PATH variable to the docker image used
to generate the wheels

Change-Id: I418a9574a7f49695984b1c68c997fc02f0450c12