Allow for user provied repo config

[smehta99]

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Description

Users want a lot of configuration options for their repository configs, we can't possibly code every option so now users will have to write their own config files. These config files will be stored as .repo files.

Please see README for config example.

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

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[smehta99]

Closing the PR. Will make a new one from smehta/repo-config branch instead of this forked one.