* Initialize fork graph in program cache during bank_forks creation
* rename BankForks::new to BankForks::new_rw_arc
* fix compilation
* no need to set fork_graph on insert()
* fix partition tests
* Move vote related code to its own crate
* Update imports in code and tests
* update programs/sbf/Cargo.lock
* fix check errors
* update abi_digest
* rebase fixes
* fixes after rebase
The core/src/ directory is already pretty crowded, and moving these
items into the subdirectory more clearly identifies that they are tied
to banking_stage.
Lucas Steuernagel
Andrew Fitzgerald
Pankaj Garg
Ryo Onodera
steviez