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
✅ -0.77% (target: -1.00%)	✅ 31.25%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (efd86d1)	3041	2371	77.97%
Head commit (589d8e9)	3053 (+12)	2357 (-14)	77.20% (-0.77%)

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)	16	5	31.25%

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

❌ Patch coverage is 31.25000% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.20%. Comparing base (efd86d1) to head (589d8e9).

❌ Your patch check has failed because the patch coverage (31.25%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1469      +/-   ##
==========================================
- Coverage   77.44%   77.20%   -0.24%     
==========================================
  Files          41       41              
  Lines        3041     3053      +12     
==========================================
+ Hits         2355     2357       +2     
- Misses        686      696      +10     

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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.