Introduces preferred addressing to the Quiche apps server and client examples

[Clendenin]

This PR:

• Introduces the preferred addressing feature, proposed here Adds Support for Preferred Addressing #1502, into the Quiche server app and client app examples
• Is a superset of that PR since it is dependent on it. Therefore it contains all the commits from it. All new code exclusively relevant to this PR can be found in the large squashed commit found here: c209958 and any subsequent commits to resolve merge/rebase issues.
• Based on this original PR by another contributor: add support for configuring and communicating preferred address #1208
• Addresses issue: Support for "server's preferred address" #828

To reproduce:

• Run server by: RUST_LOG=trace cargo run --bin quiche-server -- --cert apps/src/bin/cert.crt --key apps/src/bin/cert.key --enable-active-migration --max-active-cids 4 --preferred-address 127.0.0.1:4435
• Run client by: RUST_LOG=trace cargo run --bin quiche-client -- --no-verify --enable-active-migration --perform-migration --max-active-cids 4 https://127.0.0.1:4433
• The Quiche Client App initially migrates to the servers preferred address (127.0.0.1:4435). It then performs a subsequent migration to a new port of its own.
• Confirm migration by seeing path validations, examples below, and other logs stating the number of written bytes on your migrated path.