Release Web5 JS v0.7.9

[frankhinek]

This PR will:

• bump web5 package version to 0.7.9
• bump web5-user-agent package version to 0.1.8
• Resolves issued raised in PR Add web5-agent Dependency To dids package #107 by moving KeyValueStore from web5-agent to new common package.
• Adds eslint-plugin-mocha to all packages to check Mocha tests when running linter.
• Updates GitHub Actions CI workflow to run linting.
• Fixes prior linting errors.
• Removes .only from a web5 package test.
• Adds new credentials package to VScode workspace and Codecov configs.

[codecov]

Codecov Report

Merging #123 (0c4b078) into main (7031fd4) will increase coverage by 14.29%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##             main     #123       +/-   ##
===========================================
+ Coverage   50.45%   64.74%   +14.29%     
===========================================
  Files          33       33               
  Lines        3554     3551        -3     
  Branches       86      198      +112     
===========================================
+ Hits         1793     2299      +506     
+ Misses       1761     1250      -511     
- Partials        0        2        +2     

Components	Coverage Δ
credentials	0.00% <ø> (ø)
crypto	0.00% <ø> (ø)
dids	48.61% <0.00%> (ø)
web5	81.51% <ø> (+38.95%)	⬆️
web5-agent	0.00% <ø> (ø)
web5-proxy-agent	0.00% <ø> (ø)
web5-user-agent	79.60% <ø> (-0.04%)	⬇️