[Android] Make some spans clickable (pills, links) in TextView

[jmartinesp]

• Add an associated url to PillSpan and CustomReplacementSpan.
• Rename CustomReplacementSpan to CustomMentionSpan.
• Override EditorStyledTextView.onTouchEvent to detect clicks in these clickable spans.
• Add onLinkClickedListener to get notified when they are clicked.

[codecov-commenter]

Codecov Report

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

Comparison is base (d0ba997) 87.44% compared to head (5eeefc4) 89.34%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #860 +/- ## ============================================ + Coverage 87.44% 89.34% +1.90% ============================================ Files 165 86 -79 Lines 18816 15247 -3569 Branches 1024 0 -1024 ============================================ - Hits 16453 13622 -2831 + Misses 2077 1625 -452 + Partials 286 0 -286 ``` | [Flag](https://app.codecov.io/gh/matrix-org/matrix-rich-text-editor/pull/860/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org) | Coverage Δ | | |---|---|---| | [uitests](https://app.codecov.io/gh/matrix-org/matrix-rich-text-editor/pull/860/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org) | `?` | | | [uitests-android](https://app.codecov.io/gh/matrix-org/matrix-rich-text-editor/pull/860/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org) | `?` | | | [uitests-ios](https://app.codecov.io/gh/matrix-org/matrix-rich-text-editor/pull/860/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org) | `?` | | | [unittests](https://app.codecov.io/gh/matrix-org/matrix-rich-text-editor/pull/860/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org) | `89.34% <ø> (+3.77%)` | :arrow_up: | | [unittests-android](https://app.codecov.io/gh/matrix-org/matrix-rich-text-editor/pull/860/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org) | `?` | | | [unittests-ios](https://app.codecov.io/gh/matrix-org/matrix-rich-text-editor/pull/860/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org) | `?` | | | [unittests-rust](https://app.codecov.io/gh/matrix-org/matrix-rich-text-editor/pull/860/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org) | `89.34% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org#carryforward-flags-in-the-pull-request-comment) to find out more. [see 79 files with indirect coverage changes](https://app.codecov.io/gh/matrix-org/matrix-rich-text-editor/pull/860/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org)

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[jmartinesp]

Oops, I merged this before the CI passed for a couple of jobs. I guess I'm too used to the 'auto merge when all required jobs pass' feature on the EXA repo 😅 .