rpicamera: support changing parameters without interrupting the stream

[aler9]

Fixes #1159

The following parameters can be changed without interrupting the stream:

• rpiCameraBrightness
• rpiCameraContrast
• rpiCameraSaturation
• rpiCameraSharpness
• rpiCameraExposure
• rpiCameraAWB
• rpiCameraDenoise
• rpiCameraMetering
• rpiCameraEV
• rpiCameraFPS

[codecov-commenter]

Codecov Report

Merging #1463 (c9a883e) into main (69c9e57) will decrease coverage by 0.32%.
The diff coverage is 55.85%.

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@@            Coverage Diff             @@
##             main    #1463      +/-   ##
==========================================
- Coverage   65.68%   65.37%   -0.32%     
==========================================
  Files         118      118              
  Lines       12906    12975      +69     
==========================================
+ Hits         8477     8482       +5     
- Misses       3759     3822      +63     
- Partials      670      671       +1     

Impacted Files	Coverage Δ
internal/conf/path.go	20.96% <0.00%> (+0.22%)	⬆️
internal/core/hls_server.go	76.63% <0.00%> (ø)
internal/core/rpicamera_source.go	0.00% <0.00%> (ø)
internal/core/path.go	70.11% <47.61%> (-3.45%)	⬇️
internal/core/rtmp_conn.go	67.34% <57.14%> (+0.13%)	⬆️
internal/core/rtsp_session.go	58.07% <57.14%> (+0.26%)	⬆️
internal/core/source_static.go	79.16% <57.50%> (+8.87%)	⬆️
internal/core/hls_source.go	57.57% <76.92%> (-1.02%)	⬇️
internal/core/path_manager.go	89.29% <77.96%> (-3.43%)	⬇️
internal/core/rtsp_source.go	49.69% <80.00%> (-2.43%)	⬇️
... and 10 more

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[aler9]

added in v0.21.3