Split reusable content into separated components

[acelaya]

This PR is part of #338

Split everything that can be used on any app into @shlinkio/shlink-web-component package.

Split frontend utils and components that are required by this app and shlink-web-component into @shlinkio/shlink-frontend-kit.

[codecov]

Codecov Report

Merging #853 (a2f3673) into develop (deca5b3) will increase coverage by 0.15%.
The diff coverage is 85.39%.

@@             Coverage Diff             @@
##           develop     #853      +/-   ##
===========================================
+ Coverage    84.61%   84.76%   +0.15%     
===========================================
  Files          189      212      +23     
  Lines        10216    10630     +414     
  Branches      1442     1464      +22     
===========================================
+ Hits          8644     9011     +367     
- Misses         156      182      +26     
- Partials      1416     1437      +21     

Files Changed	Coverage Δ
shlink-frontend-kit/src/block/Message.tsx	88.88% <ø> (ø)
shlink-frontend-kit/src/block/Result.tsx	96.77% <ø> (ø)
shlink-frontend-kit/src/form/Checkbox.tsx	80.00% <ø> (ø)
shlink-frontend-kit/src/form/LabeledFormGroup.tsx	89.47% <ø> (ø)
shlink-frontend-kit/src/form/ToggleSwitch.tsx	80.00% <ø> (ø)
shlink-frontend-kit/src/navigation/NavPills.tsx	85.71% <ø> (ø)
...ink-frontend-kit/src/navigation/RowDropdownBtn.tsx	95.23% <ø> (ø)
shlink-frontend-kit/src/theme/index.ts	88.23% <0.00%> (ø)
shlink-web-component/src/api-contract/errors.ts	96.29% <ø> (ø)
shlink-web-component/src/mercure/helpers/Topics.ts	85.71% <ø> (ø)
... and 144 more

... and 29 files with indirect coverage changes

[github-actions]

Preview environment

https://shlinkio.github.io/shlink-web-client/feature/shlink-web-component/