Bugfixes:
- Fix http url redirection issue
- Fix basic/digest auth issue with http url
Features:
- Add support for adding custom http header
- Add support for reading firmware image header
- Add support for monitoring upgrade status
- This requires breaking down esp_https_ota API such that it allows finer application level control
- For simpler use-cases previous API is still supported
Closes https://github.com/espressif/esp-idf/issues/3218
Closes https://github.com/espressif/esp-idf/issues/2921
