Bitcoin Block details for get-burn-chain-info?

[friedger]

Is your feature request related to a problem? Please describe.
For catamaranswaps, I want to verify that a bitcoin tx was mined using clarity-bitcoin-lib-v5. However, clarinet returns the same block header hash for all blocks (get-burn-chain-info? header-hash u100). It is not clear what the block looks like that is used to create the hash.

Describe the solution you'd like
Simple solution: provide docs describing the mocked(?) block used to generate the hash.

Advanced solution: add section to Clarinet.toml that allows to define a bitcoin block that is used to generate the hash.

Describe alternatives you've considered
Only test for failure of on-chain verificaion

Additional context
https://github.com/friedger/clarity-catamaranswaps/pull/6/files#diff-a89b2fb3bfe4fbbcc904e8a68ec9ad8724076cfe10d8c7ddfbae1fe66bcf4879R175