refactor(plugins): add websocket methods

[alessiodf]

Partially fixes #1447 and increases websocket test coverage to 100%.

What kind of change does this PR introduce?

• Bugfix
• Feature
• Refactor
• Performance
• Tests
• Build
• Documentation
• Code style update
• Continuous Integration
• Other, please describe:

Does this PR introduce a breaking change?

• Yes
• No

Does this PR release a new version?

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• It's submitted to the develop branch, not the master branch
• All tests are passing
• New/updated tests are included

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

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[codecov-io]

Codecov Report

Merging #1451 into develop will increase coverage by 0.04%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop    #1451      +/-   ##
===========================================
+ Coverage    40.68%   40.73%   +0.04%     
===========================================
  Files          237      237              
  Lines         6572     6575       +3     
  Branches      1303     1295       -8     
===========================================
+ Hits          2674     2678       +4     
  Misses        3652     3652              
+ Partials       246      245       -1

Impacted Files	Coverage Δ
src/renderer/services/plugin-manager/websocket.js	100% <100%> (+2.63%)	⬆️
src/renderer/components/Network/NetworkModal.vue	40.93% <0%> (ø)	⬆️

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