Support remapping of west projects urls

[thorsten-klein]

Proposal for #615

Support is added for a new remapping section in the west manifest.

Under the url key, users can define search-and-replace patterns (whereby old will be replaced with new).
Those patterns are applied to all project URLs during project import (recursively).
This allows downstream projects to modify remote URLs while keeping all other metadata (e.g. original revision).
This is extremely helpful when downstream projects just want to use mirrored repositories.

Usage

In general you can specify search-replace patterns for url (or substrings from url) via west.yml.
It is a simple search-replace (no regex).
This means, for example you can add following remapping-block to your west.yml in case you have mirrored all zephyr repositories into your own "mirrors" organization in your company Github instance:

manifest:
  remapping:
    url:
      - old: github.com/zephyr-rtos
        new: github.company.com/mirrors

If the repositories are mirrored to different Github organizations or instances, you can apply multiple (more fine-granular) remapping-patterns.

manifest:
  remapping:
    url:
      - old: github.com/foo/libfoo
        new: github.company.com/foo/mirrored-libfoo
      - old: github.com/foo/libbar
        new: github.othercompany.com/forked/libbar

[codecov]

Codecov Report

❌ Patch coverage is 95.65217% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 85.05%. Comparing base (bb1c7bf) to head (cf5eba6).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/west/manifest.py	95.65%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #869      +/-   ##
==========================================
+ Coverage   84.93%   85.05%   +0.12%     
==========================================
  Files          11       11              
  Lines        3444     3467      +23     
==========================================
+ Hits         2925     2949      +24     
+ Misses        519      518       -1     

Files with missing lines	Coverage Δ
src/west/manifest.py	95.62% <95.65%> (+0.19%)	⬆️

[marc-hb]

Do you think you could focus on the west config approach first? Because it should be smaller and easier to experiment with, review, test and use in anger etc., while sharing the code with any manifest-based approach later. As discussed in #615, imports can be very tricky and very error-prone.

Obviously, your #867 will make this even easier.