Add aggregate strategies support (lateral & grouped)

[wtsnz]

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Ultimately this came out of my last pr to ash_sqlite that adds aggregate support. After talking to Zach he brought up the idea that the different aggregate strategies should probably live in ash_sql instead of specifically inside of ash_sqlite. SQLite doesn't support aggregates based on lateral queries so instead we must implement a different strategy based on windows.

Two possible approaches going forward 1 OR 2:

1. Keep the sqlite aggregate support in my last pr
   a. Add support for Aggregates ash-project/ash_sqlite#213
2. Use the newer approach (PRs) that add aggregate strategies to ash_sql and updates ash_sqlite to implement them)
   a. This PR that adds the multiple aggregate strategies to ash_sql
   b. A PR that adds the consumption of the above into ash_sqlite Add Aggregate Support using ash_sql implementation ash_sqlite#5
   c. A tiny pr to ash_postgres that explicitly states the aggregate_strategy (wtsnz/ash_postgres@c02e86f)

The direction depends on what ash community want - I'll defer to them after asking