Commit Message: dynamic_modules: HTTP filter config implementation
Additional Description:

This expands the ABI for HTTP filter configurations. Especially this adds two
even hooks coupled with the life cycle of HTTP filter config handled in the main
thread.

The key idea is to do the direct pointer (context) passing between the boundary;
This allows us to avoid maintaining IDs and global mapping state, which makes it
easier to test as well as it has benefit in terms of performance. E.g. there's no
need to look up "contexts" on each event hook entry.

The next follow-up PR will add per-stream event hooks (filter implementation).
After the event hooks are done, module->Envoy functions will be added (e.g.
accessing headers, etc.)

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

Request variables

Key	Value
ref	5bec2ab
sha	87503c9
pr	37070
base-sha	f0d5584
actor	@mathetake
message	dynamic_modules: HTTP filter config implementation...
started	1732037274.20383
target-branch	main
trusted	false

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Envoy version (as used in this CI run)