Fix custom scalar array encoding

[KingParmenides]

Summary

• preserve list wrappers in generated AllTypesProps entries for non-built-in argument types
• keep scalar list markers during path resolution so custom scalar arrays are encoded element-by-element
• add regression coverage for non-empty and empty custom scalar lists

Tests

• npx jest packages/graphql-zeus-core/TreeToTS/functions/new/buildQuery.spec.ts packages/graphql-zeus-core/TreeToTS/functions/new/resolvePath.spec.ts packages/graphql-zeus-core/TreeToTS/templates/returnedPropTypes/index.spec.ts
• npm test -- --runInBand
• npm run lint passes TypeScript, then fails on an existing unrelated @typescript-eslint/no-empty-function lint error in packages/graphql-zeus/index.ts:22

Fixes #346
/claim #346

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