Step Logging and changes to StepError type to errors

[TanmoySG]

This pull request includes significant updates to the go-steps library, focusing on logging enhancements, error handling improvements, and updates to the example usage. The most important changes include the introduction of a logging mechanism using zerolog, modifications to error handling structures, and updates to the example code to demonstrate the new features.

Logging Enhancements:

• Introduced a new logging mechanism using the zerolog package. The logger can be initialized with gosteps.NewGoStepsLogger and used within the context (go_step_logger.go).
• Added the ability to log messages within step functions using the ctx.Log() method (go_step_context.go). [1] [2]

Error Handling Improvements:

• Replaced the StepError type with the standard error type for better compatibility and simplicity (README.md, go_step_result.go, go_step_types.go). [1] [2]
• Updated the StepResult struct and related methods to handle standard errors (go_step_result.go).

Example Code Updates:

• Enhanced the example in example/multistep-example/main.go to demonstrate the new logging and error handling features, including retry logic and logging within steps. [1] [2] [3] [4] [5] [6] [7]

Documentation Updates:

• Updated the README.md to reflect the changes in error handling and to include examples of the new logging functionality. [1] [2] [3]

Miscellaneous:

• Updated the go.mod file to include the zerolog package and other dependencies.

Issue

• Closes Step Logging #19
• Closes [Feature] Logging Step Execution #3

[TanmoySG]

👍🏽