Updates performance baselines

[jasonb5]

Updates how performance baselines are created and compared.

Before

• Baseline generation stores cpl.log
• Comparison parses baseline and testcase cpl.log and compares throughput/memory
• --check-throughput and --check-memory will PASS even if MEMCOMP or TPUTCOMP fail
• bless_test_results --hist-only will update the baseline cpl.log

After

• Baseline generation stores throughput in cpl-tput.log and memory usage in cpl-mem.log
• Comparison parses testcase cpl.log and compares the baselines respective files
• --check-throughput and --check-memory will DIFF if MEMCOMP or TPUTCOMP fail
• bless_test_results now has --tput-only and --mem-only to bless individual performance DIFF
• Fixes logging throughput/memory comparison results in TestStatus.log
• Allows generation/comparison to be customized by the coupler

Test suite: pytest -vvv CIME/tests
Test baseline: n/a
Test namelist changes: n/a
Test status: n/a

Fixes E3SM-Project/E3SM#5885

User interface changes?: N
Update gh-pages html (Y/N)?: N

[jasonb5]

Leaving this as a draft until we determine if additional updates are needed from E3SM-Project/E3SM#5937 discussion.

[jgfouca]

Nice work!