Described new esp32_camera frame buffer option.

[ajwahab]

Description:

Described new esp32_camera frame buffer option.

Pull request in esphome with YAML changes (if applicable): esphome/esphome#7360

Checklist:

• I am merging into next because this is new documentation that has a matching pull-request in esphome as linked above.
  or

• I am merging into current because this is a fix, change and/or adjustment in the current documentation and is not for a new component or feature.

• Link added in /index.rst when creating new documents for new components or cookbook.

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[jesserockz]

Please resolves the conflicts and update your branch

[esphome]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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