Filter benchmarks based on tag

[kayceesrk]

Remove the custom targets _macro.json and _ci.json and replace that with a generic solution. See #195.

[kayceesrk]

@Sudha247 please see if this is what you were looking for.

[Sudha247]

Thanks for this solution @kayceesrk! This is what I was looking for. I have only one suggestion; It might useful to remove *_filtered.json during make clean. A note on this feature (in the README perhaps) would be helpful, too. :)

[shakthimaan]

LGTM

[kayceesrk]

I have only one suggestion; It might useful to remove *_filtered.json during make clean. A note on this feature (in the README perhaps) would be helpful, too. :)

Done.