[pkg/stanza] emit raw Windows events as strings instead of byte arrays

[swiatekm-sumo]

Component(s)

pkg/stanza,receiver/windowseventlog

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

Since #17858, the windows input operator can emit raw events, as an XML serialized to a byte slice. As we know this is actually a valid string, it would be more convenient if we could emit it as a string as well. Byte slices are less convenient to work with - for example, they get base64 encoded for display.

Describe the solution you'd like

Parse the event body into a string rather than a byte slice.

Additional context

Pinging @atoulme as the author of the original feature. I'm willing to work on this if we agree it's a good change.

[github-actions]

Pinging code owners:

• pkg/stanza: @djaglowski

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[djaglowski]

👍 Seems reasonable to me.

[swiatekm-sumo]

/label receiver/windowseventlog

[swiatekm-sumo]

Fixed by #22863