feat: Add support for sourceTypeOverride and sourceLocationOverride

[yamao-latte]

This commit introduces two new optional parameters:

sourceTypeOverride: Allows overriding the source input type defined in the build project for the current build. Valid values include NO_SOURCE, CODECOMMIT, CODEPIPELINE, GITHUB, S3, BITBUCKET, and GITHUB_ENTERPRISE.
sourceLocationOverride: Enables specifying a location that overrides the source location defined in the build project for the current build.

These parameters provide flexibility in customizing the source settings for individual builds, without modifying the underlying build project configuration.

Issue #164

Description of changes:

• Added sourceTypeOverride parameter to allow users to override the source input type defined in the build project.
  • Updated the action.yml file to include the sourceTypeOverride parameter with a description and set it as optional.
  • Modified the relevant code sections to handle the sourceTypeOverride parameter and pass its value to the CodeBuild API when starting a build.
• Introduced sourceLocationOverride parameter to enable users to specify a custom source location for the current build.
  • Updated the action.yml file to include the sourceLocationOverride parameter with a description and set it as optional.
  • Modified the relevant code sections to handle the sourceLocationOverride parameter and pass its value to the CodeBuild API when starting a build.
• Updated the README.md file to document the new sourceTypeOverride and sourceLocationOverride parameters, providing examples and explaining their usage.

These changes enhance the flexibility and usability of the Action, allowing users to customize their build source settings on a per-build basis and enabling integration with various source providers, including GitHub Enterprise.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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[natanaelfiorilla-scopely]

Please, review this PR.