# Description

Resolves #4395

This PR evicts persitent entries to the Hot Archive in p23.
Specifically, the background eviction scan will delete expired
persistent entries from the live bucketlist and add them to the hot
archive. This change also includes eviction meta for these types.

Operations have not yet been modified to work with the evicted entries.
This means that `InvokeHostFunctionOp` does not check the hot archive
for the existence of archived entries, and `RestoreFootprintOp` will not
be able to restore evicted entries. These changes will be added in a
follow up PR.

# Checklist
- [x] Reviewed the
[contributing](https://github.com/stellar/stellar-core/blob/master/CONTRIBUTING.md#submitting-changes)
document
- [x] Rebased on top of master (no merge commits)
- [x] Ran `clang-format` v8.0.0 (via `make format` or the Visual Studio
extension)
- [x] Compiles
- [x] Ran all tests
- [ ] If change impacts performance, include supporting evidence per the
[performance
document](https://github.com/stellar/stellar-core/blob/master/performance-eval/performance-eval.md)