Allow users to provide their own context

[tydomitrovich]

Objective

Most of the methods in the AWS SDK for Go have a "WithContext" variant that allows callers to pass in a context. I have found this feature useful for cancelling long-running calls when the parent context is canceled. It would be nice to have a SyncWithContext() method with equivalent functionality.

Deliverables

• A method that allows the caller to provide a context to the underlying sync code exists

Approach (optional)

It looks like the bulk of the code already accepts a context and the Sync method passes context.Background() to this code. We could add SyncWithContext() method that is identical to Sync() except that it uses a context parameter instead of Background(). Then Sync() could just call SyncWithContext() with context.Background() as a parameter.

[RA-Balaji]

I would like to contribute to this issue. Can I?

[at-wat]

@RA-Balaji sure, PR is welcomed!

[RA-Balaji]

Kindly review the PR: #381