chore: Change TextractPOCDecider name to DocumentMetadata

A potentially breaking change, renaming TextractPOCDecider. I think this construct is useful outside of the bounds of POC so we should probably rename it to something DocumentMetadata or DocumentGetMetadata (similar to DocumentSplitter ) and potentially add a few other data points like file size, and in future if we can find a way to implement some mechanism to detect the document’s DPI information etc. The annotator/redactor which can be similarly named as DocumentAnnotator . These together will signify heuristics based Document specific operations.