[Prompt Fix] Make prompt less confused with transaction naming

[ryanleung]

Context:

• Currently the agent can be confused with the prompt because we have defined a "transaction" type within our code. This coincides with a Metamask transaction. This is causing confusion for queries like "What is my balance?", where the prompt does not think we should do anything because it is not a Metamask transaction (i.e. it doesn't transfer payment), but it is a "transaction" within our code (current transactions we define are "Transfer" and "Balance"), so it returns a balance of 0.

For this PR, I've

• Reformatted the prompt so it's cleaner to add new information
• Renamed the "transaction" keyword to "action", because Metamask transactions are different from how we referred to transactions in the code. This was causing some confusion for the agent (e.g. asking for a balance isn't a transaction in Metamask, but it was defined as a transaction in code).

Here are screenshots:

Without this change (see how there is no transaction field filled out. The transaction field should say "balance"):

With this change (we successfully report the balance that I have, 0.01 Eth) :

I've confirmed other behavior works the same.