Allow overriding the runtime transaction account lock limit

[jstarry]

Problem

The number of accounts that can be locked by each transaction is currently limited 64 accounts but is not configurable by devs who want to test transactions with more accounts.

Summary of Changes

• Added the --transaction-account-lock-limit cli arg to solana-test-validator to override the hardcoded limit of 64
• Allow overriding the tx account lock limit in ProgramTest

Fixes #

[brooksprumo]

Would it work to add a runtime_config: Arc<RuntimeConfig> field to the Accounts struct? Feels like currently there's a lot of plumbing to get access to the runtime config param. You did a nice job of making that easy to access from the bank, maybe that'll work for Accounts too?

The one downside I see is that if the bank changes a value of its runtime config, Accounts would still have the old value (due to COW). Is that a dealbreaker?

[jstarry]

Would it work to add a runtime_config: Arc field to the Accounts struct? Feels like currently there's a lot of plumbing to get access to the runtime config param. You did a nice job of making that easy to access from the bank, maybe that'll work for Accounts too?

It could work and I was hoping to do that originally but there are a lot ways to construct Accounts and RuntimeConfig isn't always ready at each place of construction. It'd be more work to pipe the config through than it is to pass the config override to a few Accounts methods.