fix: Message properties body, createdTime, expiresTimePlus

[curtis-h]

Description:

Fixing Message properties to align with spec.

• body should be a json object, not a string
• createdTime should be a number (seconds since epoch)
• expiresTimePlus should be a number (seconds since epoch)

Making the Message.body a json obj allows us to remove JSON.parse from all it's consumers.

Improved type safety around Protocol class body parsing.

Checklist:

• [ ] My PR follows the contribution guidelines of this project
• [ ] My PR is free of third-party dependencies that don't comply with the Allowlist
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have checked the PR title to follow the conventional commit specification

[github-actions[bot]]

Lines	Statements	Branches	Functions
	75.42% (2762/3662)	65% (1339/2060)	80.51% (715/888)

JUnit

Tests	Skipped	Failures	Errors	Time
501	6 :zzz:	0 :x:	0 :fire:	1m 10s :stopwatch:

[github-actions[bot]]

# npm audit report

ws  8.0.0 - 8.17.0
Severity: high
ws affected by a DoS when handling a request with many HTTP headers - https://github.com/advisories/GHSA-3h5v-q93c-6h6q
fix available via `npm audit fix --force`
Will install rxdb@12.7.16, which is a breaking change
node_modules/engine.io-client/node_modules/ws
node_modules/rxdb/node_modules/ws
node_modules/ws
  engine.io-client  0.7.0 || 0.7.8 - 0.7.9 || 6.0.0 - 6.5.3
  Depends on vulnerable versions of ws
  node_modules/engine.io-client
  rxdb  >=13.0.0-beta.1
  Depends on vulnerable versions of ws
  node_modules/rxdb

3 high severity vulnerabilities

To address issues that do not require attention, run:
  npm audit fix

To address all issues (including breaking changes), run:
  npm audit fix --force

[github-actions[bot]]

# npm audit report

ws  8.0.0 - 8.17.0
Severity: high
ws affected by a DoS when handling a request with many HTTP headers - https://github.com/advisories/GHSA-3h5v-q93c-6h6q
fix available via `npm audit fix --force`
Will install rxdb@12.7.16, which is a breaking change
node_modules/engine.io-client/node_modules/ws
node_modules/rxdb/node_modules/ws
node_modules/ws
  engine.io-client  0.7.0 || 0.7.8 - 0.7.9 || 6.0.0 - 6.5.3
  Depends on vulnerable versions of ws
  node_modules/engine.io-client
  rxdb  >=13.0.0-beta.1
  Depends on vulnerable versions of ws
  node_modules/rxdb

3 high severity vulnerabilities

To address issues that do not require attention, run:
  npm audit fix

To address all issues (including breaking changes), run:
  npm audit fix --force