chore: modernize codebase

[pavelnikolov]

• Update CI workflows, add lint checks.
• Update Go version to v1.25
• Fix lint errors

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[Copilot]

Pull request overview

Modernizes the repository’s tooling and code style by migrating CI to GitHub Actions, adding additional automated checks (lint/modernization), and updating Go/module settings and minor code/test cleanups.

Changes:

• Replaced Travis CI with a GitHub Actions workflow that builds, tests with -race, runs golangci-lint, and enforces go fix/gofmt cleanliness.
• Added a CodeQL workflow for Go security/code scanning.
• Updated Go module version directive and applied small lint/style fixes across code, examples, and tests (including error string normalization).

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
README.md	Updates build badge to GitHub Actions workflow.
go.mod	Bumps the go directive to a newer Go version.
example_golang_lru_test.go	Refactors the LRU cache adapter to avoid embedding and aligns method calls.
dataloader.go	Normalizes panic error string formatting.
dataloader_test.go	Updates tests to match new error strings and addresses minor lint/style issues.
cache.go	Simplifies NOOP method bodies to empty blocks.
.github/workflows/go.yml	Adds GitHub Actions CI with build/test/lint plus modernization checks.
.github/workflows/codeql-analysis.yml	Introduces CodeQL scanning workflow for Go.

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