[AGPT-696] running benchmarks in CI via GHA

[aarushik93]

Initial set up to run our benchmarks when a PR is created and when code is pushed to main.

This aims to improve our dev / test / release loop

[aarushik93]

The benchmarks officially run - but they do take a long time. So if we want to I can make them run in parallel, this should eat up less of our GH minutes I believe

[linear[bot]]

AGPT-696