[refactor prompt] Adds support and tests for the show method group and the search method group

[jseagrave21]

What current issue(s) does this address, or what feature is it adding?

• Referring to Refactor prompt commands to be plugin based #623, this PR adds support for the show method group and creates the search method group as described here Refactor prompt commands to be plugin based #623 (comment)

• Some methods have been updated with minor changes. ShowAllAssets was added to incorporate approved changes from Update/Add Asset and Contract Search Methods #667 and add continuity to show asset and show contract methods.

How did you solve this problem?
Trial and Error

How did you make sure your solution works?
Unittest

Are there any special changes in the code that we should be aware of?
No

Please check the following, if applicable:

• Did you add any tests?
• Did you run make lint?
• Did you run make test?
• Are you making a PR to a feature branch or development rather than master?
• Did you add an entry to CHANGELOG.rst? (if not, please do)

[ixje]

Please split this PR into multiple. It's too big to review without losing track if changes are requested or requiring a huge effort to do so. Split it at least into the show and search group commands. Preferably split show into 2 PR's as that would already be 5 commands per PR (you might have to PR the second one after the first is in). Thanks!

[jseagrave21]

Please split this PR into multiple. It's too big to review without losing track if changes are requested or requiring a huge effort to do so. Split it at least into the show and search group commands. Preferably split show into 2 PR's as that would already be 5 commands per PR (you might have to PR the second one after the first is in). Thanks!

Okay, please confirm I should refocus this PR then have two follow on like so?

• show part 1
  • show part 2
• search

☝️ In series, not parallel (would be impossible for show part 1/2)

[ixje]

You can PR search + show part 1 in parallel. They're separate groups so can be separate PR's. Then show part 2 comes later.