feat: atchops refactor, ESP-IDF build static libraries, ESP-IDF project examples, repl example, lots of docs

[JeremyTubongbanua]

- What I did

• Made function headers formal by:
• 1. pass by value, if we are not editing the struct itself
• 2. function headers are in this general format: a. provide settings (like key, IV, etc,), b. provide src (the thing you are encrypting, decrypting, or haashing, etc,), c. provide buffer, buffer length, and buffer output length
• lots of documentation (READMEs in every package and example)
• lots of examples

• package: atclient_espidf, allows people to use this package to build static libraries of atclient and atchops for ESP-IDF projects. (NOT MbedTLS, you will have to get the MbedTLS ESP-IDF static libraries elsewhere, ESP-IDF comes with them already).

- How I did it

• fixed up function headers in atchops

- How to verify it

Tests Passing

- Description for the changelog