feat: optimize body buffering.

[jcchavezs]

This PR attemps to prove the usefulnes of #499 by refactoring the logic and avoiding buffering request/response body when no need.

Ping @M4tteoP @anuraaga @jptosso

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[sonarcloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
82 Code Smells

0.0% Coverage
0.1% Duplication

[jcchavezs]

SonarCloud is complaining about lack of coverage in files I did not touch, also I am including tests in this PR

Can we merge it as it is?