Add Server-Sent Events BBE

[MohamedSabthar]

Purpose

$subject
Fixes: ballerina-platform/ballerina-library#6790

Goals

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Certification

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Security checks

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[MaryamZi]

The rest LGTM.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud