feat: add VersionedMessage.deserializeMessageVersion utility function

[jstarry]

Problem

Lack of utility function to check the version of a serialized message without fully deserializing the message

Summary of Changes

• Added VersionedMessage.deserializeMessageVersion

Fixes #

[codecov]

Codecov Report

Merging #27415 (bfa94c0) into master (e779032) will increase coverage by 0.0%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master   #27415    +/-   ##
========================================
  Coverage    76.9%    76.9%            
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  Files          48       51     +3     
  Lines        2505     2660   +155     
  Branches      355      364     +9     
========================================
+ Hits         1927     2048   +121     
- Misses        448      481    +33     
- Partials      130      131     +1     

[steveluscher]

[steveluscher]

I haven't checked how tree-shakers treat this. If I do:

import {VersionedMessage} from 'src/message/versioned';
// ...but then only use one function
if (VersionedMessage.deserializeMessageVersion(message) === 'legacy') {
  /* ... */
}

…does the compiler shake out the other methods I haven't used?

I know it definitely works if you export each function.

export function deserializeMessageVersion(...) { ... }

…then

import {deserializeMessageVersion} from 'src/message/versioned';
if (deserializeMessageVersion(message) === 'legacy') {
  /* ... */
}

[jstarry]

Oh good question, I'd like to punt on this for now and would happily accept / implement a change that's more tree-shaker friendly if it's an issue