User configurable frame buffer.

[ajwahab]

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What does this implement/fix?

Allows user to specify number of frame buffers to be used by esp32_camera.

Types of changes

• [ ] Bugfix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Other

Related issue or feature (if applicable): fixes

Pull request in esphome-docs with documentation (if applicable): esphome/esphome-docs#4198

Test Environment

• [ ] ESP32
• [x] ESP32 IDF
• [ ] ESP8266
• [ ] RP2040
• [ ] BK72xx
• [ ] RTL87xx

Example entry for config.yaml:

# Example config.yaml
esp32_camera:
  ...
  frame_buffer_count: 2

Checklist:

• [x] The code change is tested and works locally.
• [ ] Tests have been added to verify that the new code works (under tests/ folder).

If user exposed functionality or configuration variables are added/changed:

• [x] Documentation added/updated in esphome-docs.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 53.93%. Comparing base (4d8b5ed) to head (8a5f37c). Report is 1276 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #7360      +/-   ##
==========================================
+ Coverage   53.70%   53.93%   +0.22%     
==========================================
  Files          50       50              
  Lines        9408     9678     +270     
  Branches     1654     1708      +54     
==========================================
+ Hits         5053     5220     +167     
- Misses       4056     4134      +78     
- Partials      299      324      +25     

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