feat: Add Python 3.14 zstd builtin support

[bhimrazy]

What does this PR do?

Uses Python 3.14's built-in zstd compression to remove third-party dependency while keeping backward compatibility.

requires #747

ref:

• https://docs.python.org/3.14/library/compression.zstd.html
• https://docs.python.org/3/whatsnew/3.14.html#whatsnew314-zstandard

Changes

• Added _PYTHON_GREATER_EQUAL_3_14 constant following PyTorch Lightning's naming convention
• Updated zstd imports to use compression.zstd for Python 3.14+ and third-party zstd for older versions
• Made zstd installation conditional (python_version < "3.14") in test requirements

PR review

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[codecov]

Codecov Report

❌ Patch coverage is 76.47059% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 80%. Comparing base (8437a03) to head (106c052).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #749   +/-   ##
===================================
  Coverage    80%    80%           
===================================
  Files        52     52           
  Lines      7331   7341   +10     
===================================
+ Hits       5873   5887   +14     
+ Misses     1458   1454    -4     

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[deependujha]

nice!

In python 3.14, is built-in zstd same as external zstd library?

[bhimrazy]

nice!

In python 3.14, is built-in zstd same as external zstd library?

yes @deependujha. let's see how the test goes with our ci .