fix(s2n-quic-core): add path handle maybe_update method

[camshaft]

Resolved issues:

resolves #954

Description of changes:

As noted in the linked issue, we are currently not updating the client's local path handle for the duration of the connection. This is a bigger problem when we get to XDP since we also need to store the Ethernet address for the remote handle, in addition to updating the local IP.

I've added a maybe_update function on the path handle trait so the client can update it on receiving a packet from the server.

Call outs

While I was here, I moved the limits range test into the actual limits module. The s2n-quic/src/tests.rs is for integration-level testing.

Testing:

You can see the output of the events now showing the local address on the client: https://dnglbrstg7yg.cloudfront.net/f020c737fc9f45497f3620669ff52639c6248181/interop/logs/latest/aioquic_s2n-quic/ipv6/client/logs.txt

Before it wasn't: https://dnglbrstg7yg.cloudfront.net/95db1f7e16463c77880cb69fb9e64e43f692c1ba/interop/logs/latest/aioquic_s2n-quic/ipv6/client/logs.txt

I've also included an integration test to make sure the behavior is preserved.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[harrisonkaiser]

Suggested change

	// Local max data limits should be <= u32::MAX
	// The default Local max data limits should be <= u32::MAX

When reading this code my first question was: why doesn't with_data_window have the type signature: with_data_window(_, u32) -> Result<_, _>?. Presumably its because we do want to be able set the limit higher that u32::MAX. I read this comment as a contradiction: "Local max data limit should always be <= u32::MAX".

If I read the comment correctly: then my question I ask why does with_data_window have the signature it does?

[camshaft]

This code comes from #1693 and I'm just moving it, since it doesn't really belong in this module.

To answer your question: we may increase the limit in the future. We also can't break the API so we can't change the size.