Agent.get_as as an alternative to get_asv

[jamesbraza]

I wanted to see what this Agent.get_as looks like since we've discussed it before. This PR's motivation is:

• Right now no agent in LDP estimate value
• Most unit tests (aka simple scripts) discard value

Pros:

• Simplicity/one less piece of information to comprehend for basic Agent implementations

Cons:

• Introduces room for ambiguity in runner code
• Introduces possible necessity for duplication across get_as and get_asv
• get_as is confusing because "as" is actually an English word, whereas "asv" is not
  • If you read as "get as" instead of "get action state" at first glance it's confusing

[jamesbraza]

Open to others opinions here, but reading through I feel the cons of Agent.get_as outweigh the pros of Agent.get_asv, so going to close this PR