Alter TWA snapshot parameters

[heswithme]

Summary of Changes

1. Increased Snapshot Interval:

   • The snapshot interval is now set to 1 hour (3_600 s), which reduces gas consumption.
   • Each snapshot costs ~5_500 gas in .compute_twa(). Over 7 days, this results in a maximum gas usage of 86_400 * 7 / 3_600 * 5_500 = 924_000.

2. Reordered Variables in twa Module:

   • Variables were reordered to produce cleaner and more readable memory addresses during debugging, making the module easier to work with.

3. Removed Default Snapshots in process_rewards():

   • Snapshots are no longer taken by default when calling process_rewards(), avoiding unnecessary gas costs (170_000 gas for lens.circulating_supply() when iterating through peg keepers and controllers).
   • To include snapshots when using automated keepers, one should call process_rewards(True).

[heswithme]

Piggybacking the fee_splitter new deployment, as it's a minor change in test suite.

[heswithme]

Had to fix some tests to assume non-zero initial balances in the system.
Also added some lines in tests to demonstrate how to measure gas to get tenderly-like estimation.

[AlbertoCentonze]

Nicely done, LGTM