test: fix failing example tests

[pavelnikolov]

No description provided.

[Copilot]

Pull request overview

Moves the example tests from the example/ subdirectory into the package root so they are detected and executed by go test, and renames the example functions to follow Go's ExampleX_Y convention so they appear in godoc under NewBatchedLoader.

Changes:

• Relocates ttl_cache/go-cache example into example_go_cache_test.go at repo root under package dataloader_test.
• Renames cache adapter types and example functions (e.g. ExampleGolangLRU → ExampleNewBatchedLoader_golangLRU) to avoid collisions and conform to godoc example naming.
• Updates README to reflect the new example location.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
README.md	Updates pointer to example location.
example/ttl_cache/go_cache_test.go	Deletes the old example file (moved to repo root).
example_no_cache_test.go	Repackages under dataloader_test; minor comment cleanup.
example_golang_lru_test.go	Repackages under dataloader_test, renames adapter type and example function.
example_go_cache_test.go	New file containing the relocated go-cache example with renamed adapter and example function.

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