add emitterMemBufLimit and emitterStorageType to rewriteTag

Input pauses on high pressure in complicated configs (using rewriteTag).

"If the destination for the new records generated might face backpressure due to latency or slow network, we strongly recommend enabling the filesystem mode." (https://docs.fluentbit.io/manual/pipeline/filters/rewrite-tag)

It's better to have an ability to change emitter parameters to safe ones.

Add emitter parameters to rewriteTAg and multiline, eg:

```
- rewriteTag:
emitterName: rewrite_em
emitterStorageType: filesystem
emitterMemBufLimit: 128MB

- multiline:
emitterName: multiline_em
emitterStorageType: filesystem
emitterMemBufLimit: 128MB
```

See this PR for a possible solution:
https://github.com/fluent/fluent-operator/pull/1069