docs: TSS Rosters design proposal

[kfa-aguda]

Description:

This design doc provides the specification for Rosters - a new Data Structure introduced for enabling the Threshold Signature Scheme. The proposal details the data structure and lifecycle of Rosters, as well as the changes needed from Services and DevOps.

fixes #13893

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Node: HAPI Test (Restart) Results

7 files  7 suites   8m 29s :stopwatch: 6 tests 6 :white_check_mark: 0 :zzz: 0 :x: 7 runs  7 :white_check_mark: 0 :zzz: 0 :x:

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Node: Unit Test Results

  1 559 files    1 559 suites   2h 56m 50s :stopwatch: 117 917 tests 117 858 :white_check_mark: 59 :zzz: 0 :x: 126 131 runs  126 072 :white_check_mark: 59 :zzz: 0 :x:

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Node: HAPI Test (Token) Results

 22 files   22 suites   5m 42s :stopwatch: 281 tests 281 :white_check_mark: 0 :zzz: 0 :x: 364 runs  364 :white_check_mark: 0 :zzz: 0 :x:

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Node: HAPI Test (Node Death Reconnect) Results

3 tests   3 :white_check_mark:  4m 50s :stopwatch: 3 suites  0 :zzz: 3 files    0 :x:

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 57.73%. Comparing base (9973fae) to head (a35da8f). Report is 230 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #14045 +/- ## ============================================= - Coverage 67.58% 57.73% -9.86% + Complexity 36486 21991 -14495 ============================================= Files 3732 2885 -847 Lines 149767 110609 -39158 Branches 15571 11305 -4266 ============================================= - Hits 101223 63858 -37365 + Misses 44179 43139 -1040 + Partials 4365 3612 -753 ```

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Node: HAPI Test (Crypto) Results

 32 files   32 suites   12m 18s :stopwatch: 364 tests 364 :white_check_mark: 0 :zzz: 0 :x: 395 runs  395 :white_check_mark: 0 :zzz: 0 :x:

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Node: HAPI Test (Misc) Results

 61 files   61 suites   15m 46s :stopwatch: 319 tests 319 :white_check_mark: 0 :zzz: 0 :x: 409 runs  409 :white_check_mark: 0 :zzz: 0 :x:

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Node: HAPI Test (Time Consuming) Results

19 tests   19 :white_check_mark:  22m 59s :stopwatch:  4 suites   0 :zzz:  4 files     0 :x:

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Node: HAPI Test (Smart Contract) Results

 92 files   92 suites   26m 32s :stopwatch: 660 tests 660 :white_check_mark: 0 :zzz: 0 :x: 872 runs  872 :white_check_mark: 0 :zzz: 0 :x:

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