exporter/fileexporter: Ability to add custom Log and Metric Marshalers

[sinkingpoint]

Component(s)

exporter/fileexporter

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

Similar to #14514 , it would be useful to be able to extend the file exporters list of marshalers without having to fork the exporter. Concretely, our usecase is to export syslog formatted logs to a file for our auditing pipeline.

Describe the solution you'd like

Similarly to #16514 , I'd like to introduce factory options that allow custom marshalers on top of the existing json and proto

Describe alternatives you've considered

We could submit some of these marshalers to the contrib repo, but there are quite a few usecases here for weird marshalers so it seems impractical to manage them all here

Additional context

No response

[sinkingpoint]

/cc @atingchen

[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.

[github-actions]

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

[github-actions]

Pinging code owners for exporter/file: @atingchen. See Adding Labels via Comments if you do not have permissions to add labels yourself.

[mx-psi]

I support this. However, I would like to see this in a pkg module instead of being exposed directly on the filexporter module itself.

[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:

• exporter/file: @atingchen

See Adding Labels via Comments if you do not have permissions to add labels yourself.