chore(benchops): require build tags for running command

[thehowl]

This makes execution of benchops panic if it is compiled incorrectly. Additionally, I updated the README

[Gno2D2]

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Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gnovm/cmd/benchops/tags_required.go	33.33%	1 Missing and 1 partial ⚠️

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[ltzmaxwell]

LGTM.