Various fixes and features for rl bots training

[slundqui]

This PR adds various changes to support rl bots training. Some of these changes helps take a step in allowing async trades in agent0, such that multiple transactions can be submitted on the same block.

Breaking changes

• Renaming agent.liquidate to agent.execute_liquidate.

Changes

• Splitting up getting an agent's actions (i.e., get_policy_action and get_liquidate_action) and executing an agent's actions (i.e., execute_action) into two separate steps, with execute_policy_action and execute_liquidate calling the two steps sequentially.
• Adding manual_database_sync to LocalChain.Config to allow for manual database syncing instead of syncing after every trade.
• Executing transactions (e.g., agent.open_long) no longer eagerly gets the wallet, and instead only gets wallet information if the trade crashes (the wallet was only being used for crash reporting).
• Only adds the addr -> username mapping to the database if we're not using the default username.
• Adds thread safe nonce handlers in the agent object.
• Don't set nonce for build_transaction, and set nonce after. This fixes an issue with requiring transactions to be built in order.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 86.18421% with 21 lines in your changes missing coverage. Please review.

Project coverage is 81.05%. Comparing base (378a3fd) to head (e7f7e33). Report is 84 commits behind head on main.

Files with missing lines	Patch %	Lines
...t0/core/hyperdrive/interactive/hyperdrive_agent.py	79.72%	15 Missing :warning:
...e/hyperdrive/interactive/local_hyperdrive_agent.py	91.30%	4 Missing :warning:
...yperdrive/interactive/exec/execute_agent_trades.py	77.77%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1607 +/- ## ========================================== + Coverage 81.02% 81.05% +0.02% ========================================== Files 98 98 Lines 7289 7295 +6 ========================================== + Hits 5906 5913 +7 + Misses 1383 1382 -1 ``` | [Flag](https://app.codecov.io/gh/delvtech/agent0/pull/1607/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=delvtech) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/delvtech/agent0/pull/1607/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=delvtech) | `81.05% <86.18%> (+0.02%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=delvtech#carryforward-flags-in-the-pull-request-comment) to find out more.

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