Add JSONPath scalar type and codec support

[slaskis]

Description

I have been patching postgraphile to add support for jsonpath and thought it might make sense to add upstream.

Performance impact

unknown, negligible I would presume since it just adds a codec

Security impact

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.

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Latest commit: ce8753d

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[benjie]

Looks good to me! Please:

1. Add a column to the b.types table: https://github.com/graphile/crystal/blob/main/postgraphile/postgraphile/__tests__/kitchen-sink-schema.sql#L275
2. Insert null into the column value for the first b.types row: https://github.com/graphile/crystal/blob/main/postgraphile/postgraphile/__tests__/kitchen-sink-data.sql#L158
3. Insert a sensible expression into the second b.types row: https://github.com/graphile/crystal/blob/main/postgraphile/postgraphile/__tests__/kitchen-sink-data.sql#L208
4. Add a column to the types mutation update and create operations:

   crystal/postgraphile/postgraphile/__tests__/mutations/v4/types.test.graphql

   Line 81 in dc0d446

   ltreeArray: ["Bar.Baz.Qux", "Bar.Foo.Fah"]

   and

   crystal/postgraphile/postgraphile/__tests__/mutations/v4/types.test.graphql

   Line 138 in dc0d446

   ltreeArray: ["Bar.Baz.Qux", "Bar.Foo.Fah"]

5. Ensure that the value is queried in the response to the mutation and to the types query:

   crystal/postgraphile/postgraphile/__tests__/mutations/v4/types.test.graphql

   Line 292 in dc0d446

   ltreeArray

   and https://github.com/graphile/crystal/blob/main/postgraphile/postgraphile/__tests__/queries/v4/types.test.graphql#L197
6. Run the full test suite with envvar UPDATE_SNAPSHOTS=1

Thanks!

[slaskis]

Great review thanks! 🙏 i was unable to get it to build and test (unrelated to this PR) but i’ll have another go at it later this week.

[slaskis]

All right, I managed to get the build and tests to run in an Ubuntu VM so it's looking a lot better now!

A few whitespace changes snuck in, if you want me to revert those let me know!

[benjie]

Looks good!

Might make sense for us to implement default behaviors so that orderBy/condition on jsonPath is disabled by default. You can leave that with me if you want because I can't remember how to do it off-hand.