[WIP] Support for URL redirects

[veloman-yunkan]

Related to #1001

[codecov]

Codecov Report

❌ Patch coverage is 26.66667% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 55.68%. Comparing base (dde6c50) to head (e9184d0).

Files with missing lines	Patch %	Lines
src/tools.cpp	26.66%	0 Missing and 22 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1082      +/-   ##
==========================================
- Coverage   55.90%   55.68%   -0.23%     
==========================================
  Files          99       99              
  Lines        5023     5052      +29     
  Branches     2236     2257      +21     
==========================================
+ Hits         2808     2813       +5     
- Misses        733      735       +2     
- Partials     1482     1504      +22     

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[kelson42]

AFAIK, this PR is not doing what I requested. If I don't misundestand, this is a problem.

See #1001 (comment)

[veloman-yunkan]

@kelson42 My implementation follows the plan proposed in #1001 (comment). The functionality for accessing the new flavour of redirects has to be encapsulated behind an API, and this is what this PR intends to achieve.

[kelson42]

The topic has been again discussed live in the last days, and here is the clear requirements my sides:

• mini-html redirections are a workaround and as such we are no building anything sustainable around them
• there is in particular no requirement to have a "smart" libzim around mini-html
• since the very beginning of the libzim, an effort has been made to have the libzim pretty agnostic about the type of data save in it. It is important to not build anything related to mini-html in the libzim (for this reason as well)