Add comparison of benchmarks results on different branches

[ivan-tymoshenko]

Added two new commands for benchmarking.

• bench:cmp - allows to choose two branches, run benchmarks and compare results.
• bench:cmp:ci - runs bench:cmp with default params current branch as a "new feature" branch and main branch.

If the difference between benchmarks is more or less than the threshold = 5%, it will emphasize the benchmark result with green or red color.

selecting branches:

bench:cmp:ci output example:

[mcollina]

amazing! LGTM!