AVM 8: Opcode support

[michaeldiamant]

To keep PyTeal-to-AVM parity, the ticket requests exposing AVM 8 features.

• Box opcodes via Box Storage Support #300.
• New acct_params_get fields introduced in Exposes more of AccountData to AVM go-algorand#4491.
  • Modify AccountParam to support minimum version per field.

We've opted to not expose these opcodes because we believe there's limited developer use cases.

• switch introduced in AVM: Switch opcode go-algorand#4458.
• frame pointer opcodes introduced in AVM: frame pointers go-algorand#4319.

For the following opcodes, we're working on them out-of-band to this issue:

• match, pushints, and pushbytess via Placeholder: Leverage match opcode #573.

AVM 8 version update:

• Update user guide docs. Nominally, https://pyteal.readthedocs.io/en/stable/versions.html.
• Provide https://github.com/algorand/docs/ issue for DevRel updates.
• Update MAX_TEAL_VERSION like up max teal version #146.
• Consider renaming references of TEAL version to AVM version.