Recover ChangeLogBlocks from ChangeLogFile

[gabrielbornstein]

Includes new functions to recover and initialize ChangeLogBlocks from the ChangeLogFile after the KVStore has been shutdown, and the ChangeLogFile has been written to disk.

Also includes refactoring for the KVStore test suite, so that there is less redundant code, and future tests will be more portable and easier to write.

Note: Some investigation is needed. ChangeLogBlock::verify() is failing, however, we are reading correct and consistent ChangeLogBlock data.

[tonyastolfi]

Can be const.

[gabrielbornstein]

Done

[tonyastolfi]

Not pushed yet?

[gabrielbornstein]

Something weird is going on... maybe a UI issue? I can see the const added on the most recent commit here:
https://github.com/gabrielbornstein/turtle_kv/blob/gbornste/recover-memtable/src/turtle_kv/change_log_block.hpp
As well as in my branch, but it isn't showing up in the MR. Maybe it'll get fixed with my next commit? Either way, it should actually be there

[tonyastolfi]

Problem solved; the const should be after the param list.