Added Luau Benchmark Workflows

[AllanJeremy]

Resolves #523
Resolves #524
Resolves #526
Resolves #525
Resolves #528

Summary

• Added Luau Benchmark action. Runs luau benchmarks and outputs results in the benchmark result data repo.
• Added the ability to use a different repo for storing benchmark results. GitHub pages for the results can be found here.
• Added CacheGrind variation of the benchmark action

[zeux]

Would it be feasible to merge CG & non-CG into a single .yml file? This will make it easier for us to adjust benchmarks in the future if it's all part of a single action we can eg run manually instead of having multiple.

[zeux]

Btw https://luau-lang.github.io/benchmark-data/dev/bench/ doesn't seem to have cachegrind data charts, is that correct/expected?

[AllanJeremy]

Would it be feasible to merge CG & non-CG into a single .yml file? This will make it easier for us to adjust benchmarks in the future if it's all part of a single action we can eg run manually instead of having multiple.
Yes, done!

Btw https://luau-lang.github.io/benchmark-data/dev/bench/ doesn't seem to have cachegrind data charts, is that correct/expected?

Yes, this is expected. The other benchmark results have data because we ran a manual workflow on select releases for historical data while the cachegrind one only ran on PR (no historical data) therefore there is only one data point; which makes it look like it does not have charts.

---

Update: Discussed with Chris and removed all the data (test data). New data shall be generated on the Roblox org once this is merged in

[zeux]

The extra files in bench/ look like an accidental commit of intermediate files from a local run