Implement `VERSIONS BETWEEN '<commit>' and '<commit>'` and other ref forms

SQL:2011 implements `VERSIONS BETWEEN SYSTEM TIME ... AND ...` as well as `AS OF SYSTEM TIME`. Dolt supports `AS OF` queries taking a number of different arguments:

https://docs.dolthub.com/sql-reference/version-control/querying-history#querying-past-snapshots-with-as-of

My proposal is to implement `VERSIONS BETWEEN and ` to support ref types supported by as of like commit, timestamp, `HEAD`, etc.

For example:

`select * from versions between '' and ''`

returns:

all rows that existed in that table between the commits joined together in a single table.

No implementation files or tests are named. Start by reading the linked AS OF documentation and the SQL:2011 VERSIONS BETWEEN syntax, then trace how existing AS OF references such as commits, timestamps, and HEAD are handled. Done means a VERSIONS BETWEEN query accepts those reference forms and returns rows that existed between the two commits in one table.

Written by the indexing model from the issue text.