[block-producer]: follow-up tasks

[Mirko-von-Leipzig]

Follow-up tasks from #515. Some of these require work in miden-base.

• Create and use ProposedBatch in miden-base (source) Tracked in Migrate batch and block proving to miden-base #583
• Use a more correct BatchId (source)
• Create and use ProposedBlock in miden-base (source) Tracked in Migrate batch and block proving to miden-base #583
• Loosen block selection strategy (source)
• [block-producer]: missed block strategy #523
• Improve block/batch simulation times (source and source)
• Amend GetTransactionInputs to found instead of missing notes (source)
• Instrument mempool
• Wrap AuthenticatedTransaction::inner in an Arc for cheaper copies.
• Move graph tests into a separate tests.rs file.
• Move batch limits from TransactionBatch into the mempool's batch selection strategy
• Move block limits from the block builder into the mempool's block selection strategy
• Remove transactions from the error variant of batch builder error and in general revisit all errors there.
• [block-producer]: increase block frequency #564
• [block-producer]: merge store traits #565
• [block-producer]: authenticate notes in batch builder #566

[bobbinth]

Nice! I added this issue to the current milestone, though probably not everything will end up there (e.g., ProposedBatch and ProposedBlock is definitely for the next milestone).