Add CRC functionality from ESP ROM

[jordanhalase]

• The code compiles without errors or warnings. Pre-existing warnings from unrelated code
• All examples work.
• cargo fmt was run.
• Your changes were added to the CHANGELOG.md in the proper section.
• You updated existing examples or added examples (if applicable).
• Added examples are checked in CI (awaiting approval)

Nice to have

• You add a description of your work to this PR.
• You added proper docs for your newly added features and code.

ESP ROM includes hard-coded, referentially transparent CRC functions via simple table lookups. Kilobytes of program space can be saved using them. A compile-time #[cfg] attribute is internally used to automatically link against the ROM function or to a fallback implementation if not available.

Currently, all chips implement all functions except ESP32-S2 which omits the *_be() variants. On this chip those functions will be compiled instead.

I tested the example code on a real ESP32-C3, and simulated the ESP32-S2 on Wokwi to test the fallback implementation. All examples compile.

[jessebraham]

Thanks for the contribution, this LGTM! I have tested on hardware for each supported chip, all examples are working as expected.

Seems there's a conflict with CHANGELOG.md though, if you don't mind resolving that please I'm happy to merge!

[jordanhalase]

Fixed merge conflict in CHANGELOG.md