generator: implement generator for builtin go types

[bigbes]

• supported optional types are int*, uint*, float*, bytes, string, bool
• fully redo configuration for golangci-lint
• simple tests for encoding/decoding roundtrip

Closes TNTP-3729.

[coveralls]

Pull Request Test Coverage Report for Build 17094978647

Details

• 1112 of 1208 (92.05%) changed or added relevant lines in 19 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+92.1%) to 92.053%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
bool_gen.go	60	66	90.91%
byte_gen.go	60	66	90.91%
bytes_gen.go	60	66	90.91%
float32_gen.go	60	66	90.91%
float64_gen.go	60	66	90.91%
int16_gen.go	60	66	90.91%
int32_gen.go	60	66	90.91%
int64_gen.go	60	66	90.91%
int8_gen.go	60	66	90.91%
int_gen.go	60	66	90.91%

Totals
Change from base Build 16726999280:	92.1%
Covered Lines:	1112
Relevant Lines:	1208

---

💛 - Coveralls

[oleg-jukovec]

Please, update the commit message:

Closes TNTP-3729. -> Closes TNTP-3729

[Copilot]

Pull Request Overview

This PR implements a generator for builtin Go optional types with MessagePack serialization support. The generator produces optional types for int*, uint*, float*, bytes, string, bool, and byte with comprehensive test coverage for all methods including encoding/decoding roundtrip tests.

• Introduces a template-based code generator that creates consistent optional type implementations
• Adds complete MessagePack serialization/deserialization support with proper error handling
• Provides comprehensive test coverage for all generated optional types

Reviewed Changes

Copilot reviewed 41 out of 42 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
go.mod	Updated Go version and added dependencies for msgpack, testify, and text processing
generate.go	Added go:generate directive for code generation
cmd/generator/generator.go	Core generator implementation with templates for optional types and tests
zero.go	Helper function for generic zero value initialization
msgpack.go	MessagePack encoding/decoding utilities with type checking
errors.go	Custom error types for encode/decode operations
*_gen.go	Generated optional type implementations (byte, int*, uint*, float*, string, bytes, bool)
*_gen_test.go	Generated comprehensive tests for all optional types
errors_test.go	Unit tests for error handling functionality

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[dmyger]

Closes TNTP-3729

Closes #TNTP-3729
Tasks are referenced with the symbol #.

[dmyger]

Question: Would it make sense to move the contents of this array to a separate json | yaml file and specify it as an argument for the generator?
Perhaps this will allow the generator to be reused in other projects for custom data types?

[bigbes]

This code will be optimized for client usage, when TNTP-3734 will be implemented.