Adding infrastructure for multichip tests

[ajakovljevicTT]

Ticket

Part of issue #211

Problem description

Integrating new tester class, called MultichipTester, into our testing infrastructure intt-xla. It will receive the input and output shardings from the user, the function to be tested, and the golden function which will run on CPU, in a non-sharded mode. It runs the received data and compared the results.

[github-actions]

	Tests	Passed ✅	Skipped ⚠️	Failed
TT-XLA Tests	599 ran	431 passed	168 skipped	0 failed

Test	Result
No test annotations available

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.06%. Comparing base (9ee5247) to head (1863d25).
Report is 2 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #231      +/-   ##
==========================================
+ Coverage   77.82%   78.06%   +0.24%     
==========================================
  Files          21       21              
  Lines        1028     1044      +16     
==========================================
+ Hits          800      815      +15     
- Misses        228      229       +1     

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[kmitrovicTT]

A lot of comments just organizational and naming-wise. Once that is resolved, I'll take another look.