Aws-lambda-layer

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**Miscellaneous**

- Add an option to allow user to override the default ``ignore_package_list`` when building a layer.

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**Features and Improvements**

- add the following public api:
- ``aws_lambda_layer.api.get_latest_source_version``

**Minor Improvements**

- Add ``SourceArtifactsDeployment.version`` attribute.
- Add ``LayerDeployment.layer_name`` attribute.

**Bugfixes**

- Fix a bug in ``grant_layer_permission`` that the principal is wrong.

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**Bugfixes**

- Fix a bug that the ``publish_layer`` method failed to use the right AWS boto session.

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**Features and Improvements**

- add the following public api:
- ``aws_lambda_layer.api.grant_layer_permission``
- ``aws_lambda_layer.api.revoke_layer_permission``

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**Features and Improvements**

- add the following public api:
- ``aws_lambda_layer.api.do_we_include``
- ``aws_lambda_layer.api.build_source_python_lib``

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**Minor Improvements**

- now the ``deploy_layer`` method returns a ``LayerDeployment`` object.
- now the ``publish_source_artifacts`` method returns a ``SourceArtifactsDeployment`` object.