feat: support root path for moka and mini-moka #7142

Job	Run time
build-c-doc	17s
build-cpp-doc	55s
build-dav-server-opendalfs-doc	56s
build-fuse3-opendal-doc	40s
build-haskell-doc	9m 53s
build-java-doc	16s
build-object-store-opendal-doc	41s
build-lua-doc	21s
build-ocaml-doc	5m 0s
build-nodejs-doc	20s
build-parquet-opendal-doc	46s
build-python-doc	2m 30s
build-rust-doc	4m 11s
build-unftp-sbe-opendal-doc	1m 6s
build-virtiofs-opendal-doc	27s
build-website	3m 39s
	31m 58s

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