Merge pull request #26002 from pritha-srivastava/wip-sts-assumerole-webidentity

rgw: Initial commit for AssumeRoleWithWebIdentity.

diff --cc src/common/legacy_config_opts.h
Simple merge

diff --cc src/common/options.cc
Simple merge

diff --cc src/rgw/rgw_auth_s3.cc
Simple merge

diff --cc src/rgw/rgw_auth_s3.h
Simple merge

diff --cc src/rgw/rgw_common.cc
Simple merge

diff --cc src/rgw/rgw_common.h
Simple merge

diff --cc src/rgw/rgw_rest_s3.cc
Simple merge

diff --cc src/rgw/rgw_rest_s3.h
Simple merge