feat(richtext-lexical): lexical => JSX converter (#8795)
Example:
```tsx
import React from 'react'
import {
type JSXConvertersFunction,
RichText,
} from '@payloadcms/richtext-lexical/react'
const jsxConverters: JSXConvertersFunction = ({ defaultConverters }) => ({
...defaultConverters,
blocks: {
// myTextBlock is the slug of the block
myTextBlock: ({ node }) => <div style={{ backgroundColor: 'red' }}>{node.fields.text}</div>,
},
})
export const MyComponent = ({ lexicalContent }) => {
return (
<RichText
converters={jsxConverters}
data={data.lexicalWithBlocks as SerializedEditorState}
/>
)
}
```
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