Move source files to "src" folder in clients

[trivikr]

Is your feature request related to a problem? Please describe.
The codegen clients and utility packages are developed independently, and lack standardization among them. The root TSConfig PR tries to standardize as explained in https://github.com/aws/aws-sdk-js-v3/pull/1297/files#r447210600

Describe the solution you'd like
This request is to move source files of clients in "src" folder in clients.
Most typescript projects store source files in src directory, and transpiled files in dist directory.

Describe alternatives you've considered
Retaining typescript files in root directory for clients

[github-actions]

Greetings! We’re closing this issue because it has been open a long time and hasn’t been updated in a while and may not be getting the attention it deserves. We encourage you to check if this is still an issue in the latest release and if you find that this is still a problem, please feel free to comment or open a new issue.

[github-actions]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs and link to relevant comments in this thread.