feat: Must assertions support

[lowlighter]

Closes #459

Add support to Must assertions

Example:

- steps:
  - type: exec
    script: exit 1
    assertions:
      - result.code MustEqual 0
  # Remaining steps in this context will not be executed

[fsamin]

Hi,
Many thanks for your PR.
I don't like very much this new property stop-on-failure: true, My suggestion for this feature would be to handle it through the assertions.

I think we could handle both result.code ShouldEqual 0 and result.code MustEqual 0.
Should and Must would have a different behavior like we have in testify lib with assert.Equals and require.Equals.

If a Must assertions fails : the whole testcase and testsuite would fail immediately.

What do you think ?

[lowlighter]

Yeah it's a good idea, I'll look into it 👍

[ovh-cds]

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[ovh-cds]

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