Consider python 3.12 as a default python version for OTX

[sovrasov]

CI and installation config proposal:

• min py version allowed in pyproject.toml: 3.10
• Unit tests: 3.10, 3.12
• Integration tests: 3.12

End Q3'25:

• Drop 3.10, after 3.9 is EOL

Other considerations:
Ubuntu 24.04 includes 3.12 by default
IPEX supports 3.9, 3.10, 3.11, 3.12

Some numbers from the Internet demonstrating performance difference across versions:

[kprokofi]

@sovrasov what does this graphic show?

[sovrasov]

That's a performance comparison of different python versions