Adding composition for aws aurora db & proxy

[biswajitbabu]

What does this PR do?

Adding composition for AWS Aurora PostgreSQL DB and the proxy for the DB

Motivation

We are looking for an composition which provisions an aurora PostgreSQL database and we created the composition for one of our client . Community can take benefit of this composition .

More

• [y ] Yes, I have tested the PR using my local account setup (Provide any test evidence report under Additional Notes)

• [ y] Yes, I have added a new example under examples to support my PR

• Yes, I have updated the docs for this feature

• Yes, I have linked to an issue or feature request (applicable to PRs that solves a bug or a feature request)

Note:

• Not all the PRs require examples and docs
• We prefer small, well tested pull requests. Please ensure your pull requests are self-contained, and commits are squashed

For Moderators

• E2E Test successfully complete before merge?

Additional Notes

[nabuskey]

Crossplane allows you create these IAM roles you are creating manually. Could you tell me why they are not part of a composition?

You should also document clean up process in the doc. Please also remove leading spaces in commands. Makes it hard to copy and paste.

[candonov]

lgtm

[nabuskey]

LGTM. Thank you very much for this!