Improve interpolation by re-working `Evaluate` and `Expand`

This makes a few changes:

• Introduces Evaluate that is meant to handle simple expressions
  • Error if keys are not to be found
• Reworks the ExpandString to track the ${{ and }}
  • Generate errors for misaligned ${{
  • Make Runner to pass error messages from interpolation end evaluation
• Make Expand to always mutate structure and list

assigned to @ayufan

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requested review from @josephburnett

@josephburnett This is an improvement to expressions to be more strict (on evaluation) and more lean (on interpolation), but also surface errors. This is also a interface preparation for more complex interpolation.

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• a17f8f9e - Improve interpolation by introducing `EvaluateString`

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• e4897120 - Improve interpolation by introducing `EvaluateString`

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• 00ea92ae - Improve interpolation by introducing `EvaluateString`

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• 42302540 - Improve interpolation by introducing `EvaluateString`

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mentioned in merge request !5 (merged)

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changed title from Improve interpolation by introducing Evaluate{-String-} to Improve interpolation by re-working Evaluate{+ and Expand+}

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• 4cddd91f - Improve interpolation by introducing `EvaluateString`

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• fe0be22e - Make `Expand` to retain type for a simple expansions allowing to deep pass entries
• f02e3d7b - Merge branch 'kamil-expression-retain-type' into 'kamil-expression-update'

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Looks good. Just one question.

approved this merge request

resolved all threads

merged

mentioned in commit 3896064b