feat(outputs/otel_metrics): add OTEL metrics output support

[ekoops]

What type of PR is this?

Uncomment one (or more) /kind <> lines:

/kind bug

/kind cleanup

/kind design

/kind documentation

/kind failing-test

/kind feature

Any specific area of the project related to this PR?

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/area build

/area config

area outputs

/area tests

What this PR does / why we need it:

This PR adds support to generate OTEL metrics and export them through OTLP. It also updates the labels syntax in Dockerfile to the newer one.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

[poiana]

Welcome @ekoops! It looks like this is your first PR to falcosecurity/falcosidekick 🎉

[poiana]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[Issif]

I let you fix the lint issues thanks

[Issif]

You also push metrics about the matches, can you do like for the prom metrics, and set up metrics for the outputs and inputs please