Separate metadata image fetching from metadata query

[bitbeckers]

Refactors the SupabaseCachingService to get all metadata columns except for the image. Renamed the getMetadata method to getMetadataWithoutImage to make this explicit.

Introduces MetadataImageService for fetching the image when the field is selected in a metadata query.

Query with image performance on first load:

{
  metadata(first: 10) {
    count
    data {
      allow_list_uri
      contributors
      description
      external_url
      id
      impact_scope
      impact_timeframe_from
      impact_timeframe_to
      name
      properties
      rights
      uri
      work_scope
      work_timeframe_from
      work_timeframe_to
      image
    }
  }
}

Query without image performance on first load:

{
  metadata(first: 10) {
    count
    data {
      allow_list_uri
      contributors
      description
      external_url
      id
      impact_scope
      impact_timeframe_from
      impact_timeframe_to
      name
      properties
      rights
      uri
      work_scope
      work_timeframe_from
      work_timeframe_to
      image
    }
  }
}

Closes #256

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🟢	Lines	24.24% (🎯 24%)	1049 / 4327
🟢	Statements	24.24% (🎯 24%)	1049 / 4327
🟢	Functions	59.78% (🎯 59%)	55 / 92
🟢	Branches	72.13% (🎯 72%)	176 / 244

File Coverage

No changed files found.

Generated in workflow #60 for commit 12038fc by the Vitest Coverage Report Action

[Jipperism]

lgtm