feat: add author-pluggable extension point for provider-specific message fields - #1586

Broken link to 'core/base#class-cblock' (text: '`CBlock`')

Broken link to 'core/base#class-component' (text: '`Component`')

Broken link to 'core/sampling#class-samplingstrategy' (text: '`SamplingStrategy`')

Broken link to 'core/formatter#class-formatter' (text: '`Formatter`')

Broken link to 'core/backend#class-backend' (text: '`Backend`')

Broken link to 'backends/tools#class-melleatool' (text: '`MelleaTool`')

Broken link to 'backends/cache#class-simplelrucache' (text: '`SimpleLRUCache`')

Broken link to 'backends/model_options#class-modeloption' (text: '`ModelOption`')

Broken link to 'backends/model_ids#class-modelidentifier' (text: '`ModelIdentifier`')

Broken link to 'backends/backend#class-formatterbackend' (text: '`FormatterBackend`')

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