add a execute msg to flip the finalize query

[bap2pecs]

this will be build on top of https://github.com/babylonchain/babylon-da-sdk/pull/20

the goal is when we are testing https://github.com/babylonchain/optimism/pull/7, we want to have a stub contact where the return value of QueryIsBlockBabylonFinalized can be flipped

so here are a few things to do:

• add a boolean state variable
• add a execute msg to flip the state var
• in the BlockVotes use the boolean to do some magic

still need to think about it