Support PutBlockFromURL API with arbitrary source URL support for synccopy operations.
[x] Restrict dest mode to block only. Forbid all other dest modes. auto may still be used, but must derive to block (i.e., source mode is block).
[x] Allow --remote-path with arbitrary URL support
[x] Generic HEAD on URL to fetch content length
[x] Add --server-side-copy option for synccopy that is applicable for container level support and automatically uses PutBlockFromURL for all object copies.
[x] Make server side copy default, add --no-server-side-copy option toggle
[x] Add test coverage
[x] Amend CLI usage doc and provide a sample commandline
Support
PutBlockFromURLAPI with arbitrary source URL support forsynccopyoperations.blockonly. Forbid all other dest modes.automay still be used, but must derive toblock(i.e., source mode is block).--remote-pathwith arbitrary URL supportHEADon URL to fetch content length--server-side-copyoption forsynccopythat is applicable for container level support and automatically usesPutBlockFromURLfor all object copies.--no-server-side-copyoption toggle