Loki Exporter - lokiexporter.convertLogBodyToEntry fails to quote value when there are whitespace characters

[alanhe]

Describe the bug
For the unit test: https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/exporter/lokiexporter/exporter_test.go#L294-L308,

If I replace line 301,

lr.Attributes().InsertString("random.attribute", "random")

with

lr.Attributes().InsertString("hello", "new world")

Then, it converts to:

hello=new world log message

When running the LogQL, {...} | logfmt, Loki is not able to treat new world as a unit.

What did you expect to see?
I think new world should be quoted instead:

hello="new world" log message

[TylerHelmuth]

pinging @gramidt @jpkrohling as code owners

[jpkrohling]

This seems to be a good first issue. I'm adding this to my queue, but if someone wants to grab it, just do it.