New BSIP: The LP of committee AMM pool can be a collateral of a Bitasset

The LP of committee AMM pool can be a collateral of a Bitasset, like the committee AMM pool: bitcny/bitusd, bitcny/biteur, bitusd/biteur, bitcny/bitruble...., these LP can borrow Bitasset from the Bitshares BLockchain, it can improve the efficiency of the fund.

Start by reviewing existing BSIPs and the repository's documented proposal process, then compare the committee AMM pools and Bitasset collateral behavior described in the issue. Done means a complete BSIP that defines how the listed LP assets would become collateral and explains the required protocol changes.

Written by the indexing model from the issue text.