feat: add sem_ver jsonLogic evaluator

[bacherfl]

This PR adds additional jsonLogic evaluatorsfor sem_ver, which checks if the given property is a valid semantic version string that fulfills a certain criteria (e.g. if the version is lower/greater, equal to or not equal to a certain version) .The evaluator return a boolean, indicating whether the condition has been met.

The following example shows how the evaluators can be used in a flag targeting rule:

{
  "flags": {
    "headerColor": {
      "state": "ENABLED",
      "defaultVariant": "red",
      "variants": {
        "blue": "#0000FF",
        "green": "#00FF00",
        "red": "#FF0000",
        "yellow": "#FFFF00"
      },
      "targeting": {
        "if": [
          {
            "sem_ver": [
              {
                "var": "version"
              },
              ">",
              "1.0.0"
            ]
          },
          "red",
          "green"
        ]
      },
      "source": ""
    }
  }
}

This rule will resolve to the red variant of the headerColor flag, if the version property within the evaluationContext is a semantic version string that is greater than 1.0.0.

[codecov]

Codecov Report

Merging #675 (a331028) into main (d2ce988) will increase coverage by 0.83%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #675      +/-   ##
==========================================
+ Coverage   73.81%   74.64%   +0.83%     
==========================================
  Files          25       26       +1     
  Lines        2440     2520      +80     
==========================================
+ Hits         1801     1881      +80     
  Misses        573      573              
  Partials       66       66              

Impacted Files	Coverage Δ
core/pkg/eval/json_evaluator.go	89.81% <100.00%> (+0.15%)	⬆️
core/pkg/eval/semver_evaluation.go	100.00% <100.00%> (ø)

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[toddbaert]

Looks great to me! I really like the ~ and ^ additions, thanks. I think semver is a common-enough use case that this is easily justified, many vendors support it in rules.

[thisthat]

LGTM 👍