feat: Add additionalProperties for falcosidekick service Monitor

[ArnaudCHT]

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

If this PR will release a new chart version please make sure to also uncomment the following line:

/kind chart-release

Any specific area of the project related to this PR?

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

/area falco-chart

/area falco-exporter-chart

/area falcosidekick-chart

/area event-generator-chart

/area k8s-metacollector

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer: I've added the capability to the Falco-exporter charts to set additional properties within the Service Monitor, such as relabelings, metricRelabelings, etc. I ran a Helm template and tested the Service Monitor in an OpenShift cluster.

Checklist

• [x] Chart Version bumped
• [x] Variables are documented in the README.md
• [x] CHANGELOG.md updated

[poiana]

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