[PR #8895/68629b52 backport][3.10] Cache the hash generation of the ConnectionKey

[patchback]

This is a backport of PR #8895 as merged into 3.11 (68629b5).

What do these changes do?

This hash is a bit expensive to compute and BaseConnector.connect needs to compute it many times, turn on the cache. I noticed this kept showing up in the profile when looking for another issue.

Note that master has moved to dataclasses so this is only relevant for 3.11/3.10

Are there changes in behavior for the user?

no

Is it a substantial burden for the maintainers to support this?

no

before

after

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.70%. Comparing base (e2631c7) to head (aeab59f).
Report is 215 commits behind head on 3.10.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.10    #8903   +/-   ##
=======================================
  Coverage   97.70%   97.70%           
=======================================
  Files         108      108           
  Lines       34215    34215           
  Branches     4067     4067           
=======================================
  Hits        33431    33431           
  Misses        586      586           
  Partials      198      198           

Flag	Coverage Δ
CI-GHA	97.60% <100.00%> (ø)
OS-Linux	97.27% <100.00%> (ø)
OS-Windows	94.83% <100.00%> (ø)
OS-macOS	96.96% <100.00%> (ø)
Py-3.10.11	97.05% <100.00%> (ø)
Py-3.10.14	96.98% <100.00%> (ø)
Py-3.11.9	97.22% <100.00%> (ø)
Py-3.12.4	94.63% <100.00%> (ø)
Py-3.12.5	97.01% <100.00%> (ø)
Py-3.8.10	94.46% <100.00%> (ø)
Py-3.8.18	96.79% <100.00%> (ø)
Py-3.9.13	96.95% <100.00%> (ø)
Py-3.9.19	96.89% <100.00%> (ø)
Py-pypy7.3.16	96.48% <100.00%> (+<0.01%)	⬆️
VM-macos	96.96% <100.00%> (ø)
VM-ubuntu	97.27% <100.00%> (ø)
VM-windows	94.83% <100.00%> (ø)

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