Fix: Allow expressions to return string and boolean values

[LukeFinch]

What does this pull request do?

Currently, we're unable to use logic to return boolean values or strings when using expr-eval

• Evaluated can be number, string or boolean.
• Added tests for string and boolean expressions

Testing this change

{
  "str": {
    "value": "true ? 'yes' : 'no'",
    "type": "other"
  },
  "three-bigger-than-two": {
    "value": "3 > 2 ? true : false",
    "type": "other"
  }
}

Create these tokens, values should return yes and true
In previous versions, checkAndEvaluateMaths would not parse these values properly.

Additional Notes (if any)

I'm also looking into how arrays could be handled, as I feel the map() function from expr-eval could be useful

[changeset-bot]

🦋 Changeset detected

Latest commit: d3cd026

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@tokens-studio/figma-plugin	Patch

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