refactor: factory cleanup

[alyssawilk]

As follow-on clean up for upstream filters, cleaning up more factory code.

Risk Level: low Testing: existing tests Docs Changes: n/a Release Notes: n/a

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:cat:

Caused by: https://github.com/envoyproxy/envoy/pull/23208 was opened by alyssawilk.

see: more, trace.

[alyssawilk]

So there can be different TransportSocketFactoryContextImpls over the lifetime of the server. The members which I changed should not change over the lifetime of the server - things like access log manager, and the main thread dispatcher. the stats scope and the init manager do need to be specific to the local context rather than the global server context.

[adisuissa]

So there can be different TransportSocketFactoryContextImpls over the lifetime of the server. The members which I changed should not change over the lifetime of the server - things like access log manager, and the main thread dispatcher. the stats scope and the init manager do need to be specific to the local context rather than the global server context.

Thanks for the explanation! LGTM!