feat: export pgSmartTagRulesFromJSON

[erichosick]

Description

We're building out a JSON schema -> Smart Tags File utility. We want to verify that the Smart Tags File fully compiles so we make a call to makeJSONPgSmartTagsPlugin. If that call fails, we want to throw the exception and stop building the Smart Tags File. Currently, there are just warning messages.

Exporting the pgSmartTagRulesFromJSON function gives the ability to do this.

Performance impact

There should be no impact on performance.

Security impact

unknown

Checklist

• My code matches the project's code style and yarn lint:fix passes.
• I've added tests for the new feature, and yarn test passes.
• I have detailed the new feature in the relevant documentation.
• I have added this feature to 'Pending' in the RELEASE_NOTES.md file (if one exists).
• If this is a breaking change I've explained why.