• Adds helper for getting success and error tags based on R2Result and adds it to every method
• Factors out the common logic for head, get, and put
• Adds response tags for all of the R2 methods, detailed below

For all R2 methods:

• error.type
• cloudflare.r2.response.success
• cloudflare.r2.error.message
• cloudflare.r2.error.code

For head, get, and put:

• cloudflare.r2.response.etag
• cloudflare.r2.response.size
• cloudflare.r2.response.uploaded
• cloudflare.r2.response.checksum.value
• cloudflare.r2.response.checksum.type
• cloudflare.r2.response.storage_class
• cloudflare.r2.response.ssec_key
• cloudflare.r2.response.content_type
• cloudflare.r2.response.content_encoding
• cloudflare.r2.response.content_disposition
• cloudflare.r2.response.content_language
• cloudflare.r2.response.cache_control
• cloudflare.r2.response.cache_expiry
• cloudflare.r2.response.custom_metadata

For createMultipartUpload:

• cloudflare.r2.response.upload_id

For list:

• cloudflare.r2.response.returned_objects
• cloudflare.r2.response.delimited_prefixes
• cloudflare.r2.response.truncated
• cloudflare.r2.response.cursor

delete, resumeMultipartUpload, uploadPart, complete do not have additional response tags