feat(performance): Allow the split by char optimization in projects

[wmak]

• Pretty sure I'm doing a bunch of this wrong, opening this to hopefully get feedback on the right way to approach this
• I'm also worried about the parameters in the validator being AnyExpression but couldn't find a better pattern to use
• This lets the query run now, but i see my local snuba logging: "Query is missing mandatory columns" from the MandatoryConditionEnforcer
• More info on the motivation behind this change here: https://www.notion.so/sentry/Speeding-up-the-Trace-Query-4ba8a9f3c1b445eab6f748dbe2a1817d