feat: add tags for bucket/object/group and support SetTags tx

[ruojunm]

Description

feat: add tags for bucket/object/group and support SetTags tx

Rationale

Greenfield v1.2.0 will introduce tags fields for bucket/object/group entities and also has a SetTags API to set tags for existing bucket/object/group

Example

• Create a bucket with tags

 ./gnfd-cmd bucket create --tags='[{"Key":"0","value":"value1"},{"key":"key2","value":"0"}]'   gnfd://clyde-test-3 

• Create an object with tags

 ./gnfd-cmd object put --tags='[{"key":"key1","value":"value1"},{"key":"key2","value":"value2"}]' file.txt gnfd://clyde-test-3/file.txt

• Create a group with tags

gnfd-cmd group create --tags='[{"key":"key1","value":"value1"},{"key":"key2","value":"value2"}]' clyde-group-1

• Set tags for existing bucket

./gnfd-cmd bucket setTag --tags='[{"key":"level","value":"grade3"}]' gnfd://clyde-test-2

• Set tags for existing object

./gnfd-cmd object setTag --tags='[{"key":"level","value":"grade4"}]'  gnfd://clyde-test-3/file.txt 

• Set tags for existing group

./gnfd-cmd group setTag --tags='[{"key":"level","value":"grade5"}]'  clyde-group-2

• head object/bucket/group

./gnfd-cmd object head  --format=json gnfd://clyde-test-3/file.txt 
./gnfd-cmd bucket head --format=json clyde-test-2
./gnfd-cmd group head --format=json clyde-group-2 

Changes

Notable changes:

• add tags parameters when creating objects/buckets/groups
• add a ./gnfd-cmd bucket/object/group setTag cmd to send SetTag message to greenfield chain.
• Refine json format response when heading bucket/object/group

[keefel]

The set-tag subcommand should be for gnfd-cmd bucket/object/group, not for gnfd-cmd. The correct format is 'gnfd-cmd bucket set-tags --tags='[{"Key":"0","value":"value1"},{"key":"key2","value":"0"}]' gnfd://clyde-test-3'.

[keefel]

LGTM