Invoke close on input stream when input is finished.

[ioquatix]

After reviewing https://github.com/socketry/async-http/issues/183, I think we should automatically close the input when input is read completely.

Types of Changes

• Bug fix.
• New feature.

Contribution

• [x] I added tests for my changes.
• [x] I tested my changes locally.
• [x] I agree to the Developer's Certificate of Origin 1.1.