* Add copy-on-write executor cache (#12502)
* Add copy-on-write executor cache
* Add remove_executor function to the bank
(cherry picked from commit 965f653471)
# Conflicts:
# runtime/src/bank.rs
* rebase
Co-authored-by: Jack May <jack@solana.com>
Co-authored-by: Michael Vines <mvines@gmail.com>