feat: `--luma-bias` introduces frame-level luma bias to improve quality in dark scenes

Description

Issue

This is the third Merge Request from the SVT-AV1-PSY team aiming to integrate our features into mainline SVT-AV1 under the oversight of Hassene Tmar and Faouzi Kossentini. When enabled, the --luma-bias parameter enables frame-level luma bias to improve quality in dark scenes by adjusting frame-level QP based on average luminance across each frame.

Luma bias is disabled by default in this MR.

Author(s)

Gianni Rosato (@computerbuster)

Clybius

Performance impact

• quality
• memory
• speed
• 8 bit
• 10 bit
• N/A

Test set

• obj-1-fast can be found here
• other
• N/A

Merge method

• Allow the maintainer to squash and merge when PR is ready to create a 1-commit to the master branch. The maintainer will be able to fix typos / combine commit messages to create a more readable 1-commit message or use whatever is stated in the 'Description' section
• I will clean up my commits and the maintainer shall use 'rebase and merge' to the master branch

Source/Lib/Globals/enc_handle.c

@@ -1540,7 +1540,6 @@ EB_API EbErrorType svt_av1_enc_init(EbComponentType *svt_enc_component)
         input_data.enable_variance_boost = enc_handle_ptr->scs_instance_array[instance_index]->scs->static_config.enable_variance_boost;
         input_data.variance_boost_strength = enc_handle_ptr->scs_instance_array[instance_index]->scs->static_config.variance_boost_strength;
         input_data.variance_octile = enc_handle_ptr->scs_instance_array[instance_index]->scs->static_config.variance_octile;
-        input_data.luma_bias = enc_handle_ptr->scs_instance_array[instance_index]->scs->static_config.luma_bias;
         input_data.static_config = enc_handle_ptr->scs_instance_array[instance_index]->scs->static_config;
 
         EB_NEW(