[aws-cpp-sdk-s3-crt]: handle bad input stream passed to PutObjectAsync

[grrtrr]

If PutObjectAsync is passed an input stream which is in a bad state (failbit or badbit set), the aws-c-s3 meta request fails with arcane errors, since the Content-Length is computed as the string "-1" (see #2093).

Avoid the late failure (with confusing error) by returning early with error if the user supplied an unusable input stream.

Resolves #2093.

Check all that applies:

• [X] Did a review by yourself.
• [X] Added proper tests to cover this PR. (If tests are not applicable, explain.)
• [X] Checked if this PR is a breaking (APIs have been changed) change.
• [X] Checked if this PR will not introduce cross-platform inconsistent behavior.
• [X] Checked if this PR would require a ReadMe/Wiki update.

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