Support metadata for access rule

Registered by zhongjun

The metadata here for access rule is the descriptive metadata. It's used for
discovery and identification. Users could add key-value pairs for the access rules
to describe them. And users can also filter access rules with specified metadata.

Blueprint information

Status:
Not started
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None
Priority:
Undefined
Drafter:
zhongjun
Direction:
Needs approval
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None
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
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