[skip-changelog] Do not force update index every time lib search is executed

[MatteoPologruto]

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• The PR has no duplicates (please search among the Pull Requests
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• The PR follows
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• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• UPGRADING.md has been updated with a migration guide (for breaking changes)

What kind of change does this PR introduce?

Code enhancement

What is the current behavior?

Executing lib search always downloads and updates library_index.json.

What is the new behavior?

A timeout has been introduced to avoid updating the index every time lib search is executed.

Does this PR introduce a breaking change, and is titled accordingly?

No

Other information

This is a duplicate of #1789. Since the original author did not make any recent update, I'm simply rebasing his commits and applying the suggestions. Once this PR is merged, the original can be closed.

Close #1789

[codecov]

Codecov Report

Base: 36.68% // Head: 36.65% // Decreases project coverage by -0.03% ⚠️

Coverage data is based on head (f8679ad) compared to base (396718f).
Patch coverage: 0.00% of modified lines in pull request are covered.

❗ Current head f8679ad differs from pull request most recent head 6c89894. Consider uploading reports for the commit 6c89894 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2072      +/-   ##
==========================================
- Coverage   36.68%   36.65%   -0.03%     
==========================================
  Files         228      228              
  Lines       19385    19400      +15     
==========================================
  Hits         7111     7111              
- Misses      11442    11457      +15     
  Partials      832      832              

Flag	Coverage Δ
unit	36.65% <0.00%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
internal/cli/lib/search.go	0.00% <0.00%> (ø)
arduino/cores/packagemanager/package_manager.go	67.46% <0.00%> (-0.73%)	⬇️
commands/lib/search.go	92.10% <0.00%> (+3.94%)	⬆️

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