dynamic_modules: adds on_http_filter_* event hooks

[mathetake]

Commit Message: dynamic_modules: adds `on_http_filter_* event hooks
Additional Description:

This implements HTTP filter event hooks for dynamic modules.
More precisely, envoy_dynamic_module_on_http_filter_* are added to the ABI,
and they are integrated with the HTTP filter implementation in Envoy side.

The most change here is almost mechanical despite the size of changes.

Risk Level: low
Testing: done
Docs Changes: n/a
Release Notes: n/a
Platform Specific Features: n/a
[Optional Runtime guard:]
[Optional Fixes #Issue]
[Optional Fixes commit #PR or SHA]
[Optional Deprecated:]
[Optional API Considerations:]

[repokitteh-read-only]

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🐱

Caused by: #37325 was opened by mathetake.

see: more, trace.

[mathetake]

cc @marc-barry