RA CRF mode Improvements

Description

Improvements to the Random Access mode. NOTE: Please note that speeds 6 / 7 are going to be the same and speeds 12 / 13 are going to be the same after this MR. Please refer to the discussion on #2152 for clarity on future preset roadmap.

Issue

Author(s)

@hguermaz @PhoenixWorth @psao123

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