redis Fix command BITFIELD_RO and BITFIELD argument json file, add some test cases for them (#11445)

Date: Wed Nov 2 15
Author: Wen Hui wen.hui.ware@gmail.com

Fix command BITFIELD_RO and BITFIELD argument json file, add some test cases for them (#11445) According to the source code, the commands can be executed with only key name, and no GET/SET/INCR operation arguments. change the docs to reflect that by marking these arguments as optional. also add tests.