[processor/filter] extend log filtering capabilities with body and severity

[pmm-sumo]

Is your feature request related to a problem? Please describe.

Filter processor currently has very limited log record filtering capabilities (only by matching a record basing on some attributes or resources). We could easily extend it to filter by body or severity though.

Describe the solution you'd like

filterlog already has support for matching log body and upcoming one for matching log severity

This code is shared among several components, including filter processor. We could leverage it and add easily add a capability for filtering log records basing on the matching log body or severity.

[github-actions]

Pinging code owners: @boostchicken @pmm-sumo

[cpheps]

@pmm-sumo I'd like to volunteer to take this if it's not already being worked on.

[github-actions]

This issue has been inactive for 60 days. It will be closed in 60 days if there is no activity. To ping code owners by adding a component label, see Adding Labels via Comments, or if you are unsure of which component this issue relates to, please ping @open-telemetry/collector-contrib-triagers. If this issue is still relevant, please ping the code owners or leave a comment explaining why it is still relevant. Otherwise, please close it.

Pinging code owners:

• processor/filter: @boostchicken

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[github-actions]

This issue has been closed as inactive because it has been stale for 120 days with no activity.