This PR exports a new `editorConfigFactory` that provides multiple standardized ways to retrieve the editor configuration needed for the Lexical editor.
## Why this is needed
Getting the editor config is required for converting the lexical editor state into/from different formats, as it's needed to create a headless editor. While we're moving away from requiring headless editor instantiation for common format conversions, some conversion types and other use cases still require it.
Currently, retrieving the editor config is cumbersome - you either need an existing field to extract it from or the payload config to create it from scratch, with multiple approaches for each method.
## What this PR does
The `editorConfigFactory` consolidates all possible ways to retrieve the editor config into a single factory with clear methods:
```ts
editorConfigFactory.default()
editorConfigFactory.fromField()
editorConfigFactory.fromUnsanitizedField()
editorConfigFactory.fromFeatures()
editorConfigFactory.fromEditor()
```
This results in less code, simpler implementation, and improved developer experience. The PR also adds documentation for all retrieval methods.
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