feat: timers in plugins

[alessiodf]

Resolves #1446 by implementing a TIMERS permission that exposes clearInterval, clearTimeout, setInterval and setTimeout.

It uses internal arrays to store the IDs of any timeouts and intervals to make sure they are all cleared once the route navigation changes and it also works with nested timers. A watchdog object is used to keep track of pending timeouts so they are immediately removed from the array once executed in order to prevent excessive memory usage that could potentially arise by repeatedly executing timeouts. The IDs are also removed from their respective arrays when clearInterval or clearTimeout are called. It also includes appropriate tests.

The reason for adding the feature was outlined in #1446.

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 #1452 into develop will increase coverage by 0.54%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop    #1452      +/-   ##
===========================================
+ Coverage    40.86%   41.41%   +0.54%     
===========================================
  Files          237      237              
  Lines         6585     6616      +31     
  Branches      1298     1306       +8     
===========================================
+ Hits          2691     2740      +49     
+ Misses        3651     3645       -6     
+ Partials       243      231      -12

Impacted Files	Coverage Δ
src/renderer/services/plugin-manager.js	14.44% <100%> (+12.31%)	⬆️
src/renderer/components/Network/NetworkModal.vue	40.93% <0%> (ø)	⬆️
...derer/services/plugin-manager/wallet-components.js	66.66% <0%> (+66.66%)	⬆️

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