docs: update gRPC component design doc

[MiroslavGatsanoga]

Description:

Adding more details to gRPC component design doc.

Related issue(s):

Fixes #16599

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (1901fc3)	97954	64200	65.54%
Head commit (24210ff)	97954 (+0)	64200 (+0)	65.54% (+0.00%)

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 (#16709)	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 63.86%. Comparing base (1901fc3) to head (24210ff).

Additional details and impacted files

@@            Coverage Diff             @@
##             develop   #16709   +/-   ##
==========================================
  Coverage      63.86%   63.86%           
  Complexity     20578    20578           
==========================================
  Files           2540     2540           
  Lines          95189    95189           
  Branches        9944     9944           
==========================================
  Hits           60795    60795           
  Misses         30799    30799           
  Partials        3595     3595           

[iwsimon]

LGTM, thanks @MiroslavGatsanoga

[thomas-swirlds-labs]

LGTM. Thanks @MiroslavGatsanoga