Proposal for an OptionSet-based reset function.

[mbarnach]

Allow to reset the buffer before sending the response.

This is an alternate proposition to #1551

WIP, no tests until it is set relevant.

Description

When sending a response using .send, the body content is inaccessible.
But sometimes, it makes sense to reset the buffer before sending,
eg. an error handler that remove internal details,
sending a JSON payload, not knowing if there is already something inside, etc.

Motivation and Context

When capturing internal error and making them more explicit, eg. RFC 7807,
we need to reset the buffer to avoid appending internal content
or sending an invalid (JSON) payload.

How Has This Been Tested?

Not yet.

Checklist:

• If applicable, I have updated the documentation accordingly.
• If applicable, I have added tests to cover my changes.

[sonarcloud]

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