feat: automatic op

[rjfonseca]

Adds Op automatically when using errors.With. The default value comes
from go's runtime and will be something like package.funcname.

If an Op was manually added the automatic Op will be skipped.

For anonymous functions a line number is also added.

Both the line number and automatic op can be turned off by Global
variables and environment variables.

Example of a complete error: main.doGreetings.func1 (line 52): main.doGreetings: main.greetings: sayHello: [fatal] (RUNTIME_ERROR) name cannot be empty {context3: value3, context2: value2, context1: value1}

[Copilot]

Pull Request Overview

This PR implements an automatic operation (Op) feature for error wrapping using errors.With. It adds support for automatically generating an Op based on the caller’s context, allows including line number information for anonymous functions, and refactors some error value functions into a dedicated file.

• Introduces global flags and environment variable support for automatic Op and verbosity.
• Adds functions to retrieve caller information and modify the error chain with automatic Ops.
• Refactors error value functions by moving them to separate files and removing redundant code.

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
with.go	Implements automatic Op addition and caller context processing.
value.go	Provides error value retrieval functions (new extraction of value logic).
kv.go	Updates key-value stringification and simplifies key-value construction.
formatter_test.go	Adjusts expected error formatting output to include new key ordering.
formatter.go	Updates default formatter selection and refines error string assembly.
example/main.go	Demonstrates new error wrapping behavior with automatic Op and flags.
error_test.go	Removes old tests, potentially affecting overall test coverage.
error.go	Removes several exported value functions, possibly altering the public API.

Comments suppressed due to low confidence (3)

formatter.go:10

• The identifier 'FullFormater' appears to be misspelled. Consider renaming it to 'FullFormatter' for consistency and clarity.

DefaultFormatter = FullFormater

error_test.go:1

• The removal of error_test.go may reduce test coverage for error handling functionality. Please ensure that the automatic op features are adequately tested elsewhere.

package errors

error.go:1

• Several exported functions have been removed from error.go. Verify that these removals are intentional and that any necessary functionality is properly migrated to avoid breaking the public API.

package errors