More changes for mindtouch scraper

[benoit74]

Changes:

• fix repr of ZimPath / HttpUrl which where too long and not working
• add support for no pre_head_insert in html rewriter and no js_notify callback in all rewriters
• instead of build items_to_download in the rewriter, return complete url rewrite information so that 'users' (e.g. mindtouch scraper) can decide what they want to do

Nota:

• this has been tested with upcoming changes for mindtouch scraper and is supposed to be feature-complete. In last (and biggest) change, the signature of rewriters are not significantly modified so it is not expected to cause significant changes in warc2zim once we will start https://github.com/openzim/warc2zim/issues/411

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (1c2c37e) to head (4ac7665). Report is 4 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #208 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 38 38 Lines 2219 2221 +2 Branches 426 426 ========================================= + Hits 2219 2221 +2 ```

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