pyth pull oracle feed limits

[jgur-psyops]

Currently, Pyth pull oracles allow any feed with a matching feed ID. In the vast majority of cases, we simply use one feed, and the added complexity is a headache when trying to discover the feed for a given bank.

• Add a new oracle adapter for pyth pull that simply checks the feed key matches
• For current pull feeds, convert them to this new oracle type the next time they are cranked
• in a later update, remove the current pyth pull adapter