feat: refine work with membership info and other meta information

[weboko]

Problem / Description

There are a few problems with the current adapter:

• idCommitment is a stringified hex
• getMembershipInfo doesn't return all available membership info fields
• validateRateLimit validates the upper and lower bounds defined in the adapter, instead of the contract

Solution

• use bigint for idCommitment instead of string
• fix: getMembershipInfo to fetch, and return, ALL available data
• fix: validate rate limits from contract