Lexical server features are able to add components to the import map through the `componentImports` property. As of now, the client feature did not have access to those. This is usually not necessary, as those import map entries are used internally to render custom components server-side, e.g. when a request to the form state endpoint is made.
However, in some cases, these import map entries need to be accessed by the client feature (see "Why" section below).
This PR ensures that keyed `componentImports` entries are made available to the client feature via the new `featureClientImportMap` property.
## Why?
This is a prerequisite of the lexical [wrapper blocks PR](https://github.com/payloadcms/payload/pull/9289), where wrapper block custom components need to be made to the ClientFeature. The ClientFeature is where the wrapper block node is registered - in order to generate the wrapper block node, we need access to the component
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