Add Apache Avro schema interface types

[Copilot]

This PR implements TypeScript interfaces for Apache Avro schema types based on the Apache Avro 1.12.0 specification. The implementation provides comprehensive type definitions for all Avro schema types including primitive types, complex types, and logical types.

What's Added

New file: src/avro/types.ts

The implementation includes:

Primitive Schema Types

• AvroNullSchema, AvroBooleanSchema, AvroIntSchema, AvroLongSchema
• AvroFloatSchema, AvroDoubleSchema, AvroBytesSchema, AvroStringSchema

Complex Schema Types

• AvroRecordSchema with AvroRecordField interface for structured data
• AvroEnumSchema for enumerated values
• AvroArraySchema and AvroMapSchema for collections
• AvroUnionSchema for union types
• AvroFixedSchema for fixed-length binary data

Logical Types

Extended types built on primitives:

• Date/time types: AvroDateLogicalType, AvroTimeMillisLogicalType, AvroTimestampMillisLogicalType, etc.
• AvroDecimalLogicalType with precision and scale
• AvroUuidLogicalType for UUID strings
• AvroDurationLogicalType for time durations

Union Types

• AvroPrimitiveSchema, AvroComplexSchema, AvroNamedSchema
• Main AvroSchema union type encompassing all schema types

New file: .github/copilot-instructions.md

Contains coding guidelines for the project including commit style and quality requirements.

All interfaces follow the official Apache Avro specification and include proper TypeScript typing with JSDoc documentation. The types support both object-style schemas and string shorthand notation as defined in the Avro spec.

Fixes #39.

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[streamich]

Create .github/copilot-instructions.md file with contents:

- Do not add trivial comments, usually do not add blank lines inside functions.
- Use Angular style commits, e.g `feat: implemented xyz`.
- Make sure tests (`yarn test`) pass.
- In the end, make sure linter and formatter pass.

[streamich]

Remove all functions from this file, only types here.

[Copilot]

Removed all functions from the types file, keeping only type definitions. Commit: a431b5d

[Copilot]

Create .github/copilot-instructions.md file with contents:

Created .github/copilot-instructions.md with the specified coding guidelines. Commit: a431b5d

[streamich]

LGTM

[streamich]

Run formatter and linter. Make sure they pass.

[Copilot]

Run formatter and linter. Make sure they pass.

Ran prettier formatter and tslint successfully. All tests pass. Commit: 59b853c

[github-actions]

🎉 This PR is included in version 1.5.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀