test: cli: adding wallet tests

[TheMenko]

Related Issues

This PR is related to #8048.
The chain cli test branch have been merged into this PR, so #8048 should be merged first.

Proposed Changes

This PR adds wallet tests for CLI.
Most of the wallet cli commands have been tested.
It uses the mocked API from chain cli test branch.

Additional Info

Checklist

Before you mark the PR ready for review, please make sure that:

• All commits have a clear commit message.
• The PR title is in the form of of <PR type>: <area>: <change being made>
  • example: fix: mempool: Introduce a cache for valid signatures
  • PR type: fix, feat, INTERFACE BREAKING CHANGE, CONSENSUS BREAKING, build, chore, ci, docs,perf, refactor, revert, style, test
  • area: api, chain, state, vm, data transfer, market, mempool, message, block production, multisig, networking, paychan, proving, sealing, wallet, deps
• This PR has tests for new functionality or change in behaviour
• If new user-facing features are introduced, clear usage guidelines and / or documentation updates should be included in https://lotus.filecoin.io or Discussion Tutorials.
• CI is green

[TheDivic]

@TheMenko You should check for output of cli commands, but don't be to specific, don't do exact string matching but look for some important substrings. For example if a CLI command outputs a bunch of text but somewhere in that text you expect to see a specific address, look for that address using assert.Contains(t, out, address.String()), you don't care about the rest.
And it would be really awesome if you added a test for wallet import (with file mocking that we discussed previously).

[magik6k]

We should do some asserts on the output here