chore: Update whatsnew and doc

[dipinknair]

Update whatsnew with gRPC development and banner because of breaking change.

New doc : https://mechanical.docs.pyansys.com/pull/1469/

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.40% (target: -1.00%)	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (4038281)	3030	2362	77.95%
Head commit (1be9598)	3030 (+0)	2350 (-12)	77.56% (-0.40%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1469)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.55%. Comparing base (4038281) to head (1be9598).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1469      +/-   ##
==========================================
- Coverage   77.95%   77.55%   -0.40%     
==========================================
  Files          41       41              
  Lines        3030     3030              
==========================================
- Hits         2362     2350      -12     
- Misses        668      680      +12     

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[github-actions]

The documentation for this pull request will be available at https://mechanical.docs.pyansys.com/pull/1469. Please allow some time for the documentation to be deployed.

I will have to make more changes after discussion with Sami.