RA CRF mode + VBR Improvements

Description

Improvements to the Random Access mode.
Change the Multi-pass VBR to two-pass VBR.

Issue

Fixes #2145 (closed) and #1952 (closed)

Author(s)

@hguermaz @PhoenixWorth @dxyliu @psao123 @anaghdin

Performance impact

Performance change with respect to V1.8

Preset	PSNR Y	SSIM Y	VMAF-NEG	Cycles Dev
MR	0.87%	0.81%	0.70%	104.46%
M0	0.41%	0.53%	0.14%	17.91%
M1	0.33%	0.44%	-0.11%	18.35%
M2	0.19%	0.17%	-0.04%	15.11%
M3	1.09%	1.15%	0.66%	28.43%
M4	0.24%	0.17%	-0.09%	11.61%
M5	1.38%	1.66%	0.86%	21.92%
M6	1.13%	1.06%	0.24%	10.74%
M7	1.87%	1.78%	0.96%	14.99%
M8	0.18%	0.51%	-0.71%	3.90%
M9	-3.97%	-3.52%	-4.88%	-13.21%
M10	-3.97%	-3.52%	-4.88%	-13.21%
M11	-1.85%	-1.44%	-1.86%	-6.62%
M12	-1.27%	-1.24%	-0.32%	-4.96%
M13	-5.37%	-2.49%	-2.99%	-5.64%

• 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