[FEATURE] capture branch/commit metadata in perf results file

Is your feature request related to a problem? Please describe. Currently our current.perf and baseline.perf contain only performance results. Hence having such files does not allow you to tell on which code version were these results gathered. Having that info would tag our measurements with code version.

Describe the solution you’d like

• First line of .perf file could contain { metadata: { branch: 'branchname', hash: 'commitHash' }} as first line in the file that would not contain regular performance measurement entries but only metadata related to the measurements.
• Since do not to want to directly integrate reassure measure which creates these files with any version control system, these could be passed as runtime flags, eg. reassure measure --branch branchname --hash commitHash.
• User would pass this data from his reassure-tests.sh script, on CI and perhaps locally

Describe alternatives you’ve considered None

Additional context None

[mdjastrzebski]

@ShaswatPrabhat thanks for contributing this feature. Would you fancy going a step further and doing #207?

[ShaswatPrabhat]

Please find the PR