Delegate version number comparisons to language agents

[mscottford]

Different language ecosystems have different rules about version number formatting, valid syntax, sorting, and equivalence. It's unrealistic to expect the core CLI to correctly handle all of these differences.

A new gRPC method should be added to the language agent specification that can be used to compare two version strings, CompareVersions(string, string). This will behave similarly to typical compare functions:

• If the two values are equivalent, then the result will be 0.
  • The strings do not need to be equal to be equivalent. 1.0 is likely equivalent to 1.0.0.0, but ecosystem rules should be used to make that determination.
• If the first value is less than the second value, then the result will be less than 0.
• If the first value is greater than the second value, then the result will be greater than 0.

[mscottford]

This should be competed before corgibytes/freshli#19 is considered complete.