Add Service Binding, DHCP4, IP4 Config2, HTTP, and TLS Config Protocols

[ben-krieger]

As part of a private project, I needed additional network protocols, so I added these bindings. The private project has shifted in scope a bit, so I never got around to cleaning this work up. However, I wanted to make sure to at least open a PR in case this work was of use to someone else and they wished to either take on completing the higher level (above uefi-raw) impls or wished to accept it as is: working, but somewhat incomplete.

(Specifically, the raw FFI bindings to C are complete, but the higher level protocols using Rust types in the uefi package do not make use of all the lower protocol functions.)

You may also wish to separate out the first two commits, which deal with Service Binding protocol. This was necessary to implement network protocols, but is technically separate and involves a complex set of changes to, including a proc macro.

This has been tested mainly with QEMU+OVMF.

Checklist

• Sensible git history (for example, squash "typo" or "fix" commits). See the Rewriting History guide for help.
• Update the changelog (if necessary)

[phip1611]

Hey, nice, thanks for the contribution! I probably don't have the time to look into this soon, but nevertheless it's a good starting point for someone other to polish the MR a bit and then merge it eventually