Add component to collect elements for visits comparison

[acelaya]

Add a <VisitsComparisonCollector /> component that can be used to collect short URLs, tags or domains which visits we want to collect.

The component sticks to the top when scrolling down, making sure it is always visible, and keeps its state even when filtering or paginating the list it is rendered next to.

This PR adds that component to the short URLs list as a proof of concept.

Grabacion.de.pantalla.desde.2023-12-16.09-03-42.webm

Part of #7

[codecov]

Codecov Report

Attention: 25 lines in your changes are missing coverage. Please review.

Comparison is base (85eb4da) 79.27% compared to head (172f5a9) 79.38%.

Files	Patch %	Lines
src/short-urls/helpers/index.ts	70.37%	0 Missing and 8 partials ⚠️
...ts/visits-comparison/VisitsComparisonCollector.tsx	91.54%	0 Missing and 6 partials ⚠️
...isits/visits-comparison/VisitsComparisonContext.ts	86.48%	0 Missing and 5 partials ⚠️
src/short-urls/helpers/ShortUrlsRowMenu.tsx	85.00%	0 Missing and 3 partials ⚠️
src/visits/visits-comparison/VisitsComparison.tsx	0.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #162      +/-   ##
==========================================
+ Coverage   79.27%   79.38%   +0.11%     
==========================================
  Files         151      154       +3     
  Lines        8694     8845     +151     
  Branches     1090     1109      +19     
==========================================
+ Hits         6892     7022     +130     
- Misses        739      741       +2     
- Partials     1063     1082      +19     

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