fix(graphile-settings): standalone UppercaseEnumsPlugin for v4 CONSTANT_CASE enum values

[pyramation]

fix(graphile-settings): add UppercaseEnumsPlugin for v4 CONSTANT_CASE enums

Summary

Adds a standalone UppercaseEnumsPlugin that overrides PostGraphile v5's enumValue inflector to uppercase enum values, restoring the v4 behavior where PostgreSQL enum values like app, core, module become APP, CORE, MODULE in the GraphQL schema.

In v5, the default enumValue inflector in PgCodecsPlugin just calls coerceToGraphQLName(value), which preserves the original Postgres casing. This plugin delegates to the previous inflector (retaining special character handling) then applies .toUpperCase().

Three files changed:

• New: plugins/uppercase-enums.ts — standalone plugin + preset
• Modified: plugins/index.ts — re-exports the new plugin
• Modified: presets/constructive-preset.ts — adds UppercaseEnumsPreset to the main preset

This is an alternative to PR #702, which inlined the same logic into InflektPlugin. This approach keeps it as a separate, independently toggleable plugin.

Review & Testing Checklist for Human

• Verify behavior with a live schema: No integration test exists — spin up PostGraphile with a custom enum type (e.g., CREATE TYPE module_type AS ENUM ('app', 'core', 'module')) and confirm the GraphQL schema shows APP, CORE, MODULE
• Check impact on non-custom enums: .toUpperCase() is applied to all enum values (OrderBy enums like ID_ASC, filter enums, etc.). These should already be uppercase so it should be a no-op, but worth spot-checking that nothing breaks
• Confirm v4 parity for mixed-case enums: If any Postgres enums use camelCase values like myValue, this produces MYVALUE (not MY_VALUE). Verify this matches v4's behavior — v4 also did a simple uppercase, not a CONSTANT_CASE transform

Notes

• The previous! non-null assertion is safe because PgCodecsPlugin always defines enumValue, but if the plugin ordering ever changes this could throw
• Link to Devin run: https://app.devin.ai/sessions/9842845c47f54bdeb5a1aed39e1f53e7
• Requested by: @pyramation

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[Zetazzz]

The 702's been merged, we close this for now