Added Support for referencing custom configuration in CodeDeploy

[Buffer0x7cd]

Issue #, if available:
#836
Description of changes:
Added a list of predefined configurations provided by CodeDeploy. If the user provided configuration is one of the predefined configurations then the generate Cloudformation will have "CodeDeployDefault.Lambda as a prefix, but if it's a custom CodeDeploy Configuration then the Prefix will not be added
Description of how you validated changes:
Added relevant unit tests and the end to end tests.
Checklist:

• [ x] Write/update tests
• [ x] make pr passes
• Update documentation

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

[codecov-io]

Codecov Report

Merging #848 into develop will increase coverage by 0.02%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop     #848      +/-   ##
===========================================
+ Coverage    94.62%   94.65%   +0.02%     
===========================================
  Files           69       69              
  Lines         2997     3011      +14     
  Branches       554      559       +5     
===========================================
+ Hits          2836     2850      +14     
  Misses          85       85              
  Partials        76       76

Impacted Files	Coverage Δ
...el/preferences/deployment_preference_collection.py	90.9% <100%> (+2.02%)	⬆️

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[Buffer0x7cd]

@jlhood There were few tests that are using custom deployments type in deployment preference and expecting the generated cloudformation to have CodeDeployDefault.Lambda prefix(https://github.com/awslabs/serverless-application-model/blob/805cc85bc26cfda16e9611c047e38f78560ad6e6/tests/translator/model/preferences/test_deployment_preference_collection.py#L66) While few of them are having a typo(https://github.com/awslabs/serverless-application-model/blob/805cc85bc26cfda16e9611c047e38f78560ad6e6/tests/translator/input/function_with_deployment_preference.yaml#L10). Due to this, I needed to update those test cases so that they can work with the changes introduced in this PR.

[jlhood]

Really excited about this change! Thanks so much. I called out one issue that needs to be addressed before we can merge this.

[jlhood]

Thanks for updating! I think I have a simpler way to do the recursive replacement. Let me know what you think!

[jlhood]

Great job with this! Just a few minor cleanups to get tests passing. Also, could you make a small update to the safe deployments documentation page noting that custom deployment configurations are supported?

https://github.com/awslabs/serverless-application-model/blob/develop/docs/safe_lambda_deployments.rst

Thanks so much for iterating on this PR. It's super close. Looking forward to having this feature in SAM!