MQTT: Support for certificate bundle; Client clean-up
* Closes https://github.com/espressif/esp-idf/issues/7040
* Merges https://github.com/espressif/esp-idf/pull/7041
* Update submodule: git log --oneline 9fdf7b61385633075d5c3b84803f2dd0578d7869..f10321a53b53a146ee299cfecc320b89c0cf6611
Detailed description of the changes:
* Remove unnecessary parentheses
- esp-mqtt commit: db13533904
- esp-mqtt MR: espressif/esp-mqtt!101
* outbox: Cleanup all items when connection closes
- esp-mqtt commit: 1a94efe8b9
- esp-mqtt MR: espressif/esp-mqtt!104
* Outbox: Removes unnecessary calls to outbox_set_pending
- esp-mqtt commit: 36a3990404
- esp-mqtt MR: espressif/esp-mqtt!105
* MQTT: Makes abort connection function void.
- esp-mqtt commit: 67553aba45
- esp-mqtt MR: espressif/esp-mqtt!106
* Client: Removes unused defines
- esp-mqtt commit: eec6f0e17d
- esp-mqtt MR: espressif/esp-mqtt!100
- Closes https://github.com/espressif/esp-mqtt/issues/194
* Config: Added support for certificate bundle
- esp-mqtt commit: 06157be118
- esp-mqtt MR: espressif/esp-mqtt!98
- Closes https://github.com/espressif/esp-mqtt/issues/190
* Config: Adds missing field at config struct (path field)
- esp-mqtt commit: 5b27d1896e
- esp-mqtt MR: espressif/esp-mqtt!96
* Client: Add support for partial transport writes
- esp-mqtt commit: d8c9c7a9e7
- esp-mqtt MR: espressif/esp-mqtt!99
- Partially addresses https://github.com/espressif/esp-idf/issues/6940
* Client: Add support for Retain flag in messages posted by events
- esp-mqtt commit: a00a3134c6
- esp-mqtt MR: espressif/esp-mqtt!99
- Closes https://github.com/espressif/esp-mqtt/issues/193
* esp-mqtt: Added nullchecks for public APIs
- esp-mqtt commit: 2f57985c0b
- esp-mqtt MR: espressif/esp-mqtt!94
- Closes https://github.com/espressif/esp-mqtt/issues/185
* esp-mqtt: Reduce the includes used in all files
- esp-mqtt commit: 87fcce72c9
- esp-mqtt MR: espressif/esp-mqtt!93
* mqtt_outbox: Use STAILQ_FOREACH for outbox_delete_single_expired
- esp-mqtt commit: ff8e64839a
- esp-mqtt MR: espressif/esp-mqtt!97
- Merges https://github.com/espressif/esp-mqtt/pull/187
* Client: Add optimize for depend on ssl
- esp-mqtt commit: 8f3cac8c36
- esp-mqtt MR: espressif/esp-mqtt!95
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