docs: tss block signing proposal

[edward-swirldslabs]

This PR creates the TSS-Block-Signing proposal

Fixes #14268

[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 (7a4616b)	108968	67303	61.76%
Head commit (17db675)	108968 (+0)	67303 (+0)	61.76% (+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 (#15160)	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 58.22%. Comparing base (7a4616b) to head (17db675).
Report is 15 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop   #15160   +/-   ##
==========================================
  Coverage      58.22%   58.22%           
  Complexity     21573    21573           
==========================================
  Files           2779     2779           
  Lines         109151   109151           
  Branches       11163    11163           
==========================================
  Hits           63554    63554           
  Misses         41738    41738           
  Partials        3859     3859           

[anthony-swirldslabs]

+1