feat(ch422g): support enter/exit sleep (#20)

* fix(port): fix discarded qualifiers warning @isthaison (#22)

Closes #22

* feat(ch422g): support enter/exit sleep

Merge pull request #18 from esp-arduino-libs/feat/maintain_compatibility

feat(repo): add legacy header files to maintain compatibility

feat(base): update base class (#17)

Merge pull request #13 from esp-arduino-libs/feat/refactor_with_utils

feat(repo): refactor with esp-lib-utils

Upload to the ESP Registry and support to build on the esp-idf

Update CH422G and add a new example

Closes #7
Closes #5

Update the example to show how to use the CH422G

update changelog (#2)

init