inspect improvements and new features

[nickfrosty]

As the inspect command gets completed and merged (via #30), this issue will be used to track additional features/enhancements to improve:

General things, not necessarily part of a single inspect functionality

• add useful flags to help minimize and/or control the output (i.e. only overview, verbose transaction logs, etc)
• maybe support some sort of "plugin system" to allow devs to have more fine grain control - request here
• add some caching for transactions and blocks to speed things up for multiple retrievals of the same data, like changing the output level of data in the CLI or other cli flags
• using custom rpc urls from the solana.toml file (including env keys)

Transactions

• transactions logs to show accounts used by cpi - request here
• transactions simulation - request here

Accounts

• parsing accounts for SPL accounts (at least token)
• parsing account data based on IDLs - see here and here
• programs - showing more information like the current explorer does - example

Blocks

• CU consumed by a block - request here and here
• support range queries - request here
• get the leader schedule and see which blocks a validator produced