Remove EventStreamWriter implementation from mime

[MohamedSabthar]

Current Limitation

With the new API introduced with Java 21 runtime migration, a EventStreamWriter Ballerina wrapper class is no longer required to write the event stream to a Java OutputStream. The EventStreamWriter implementation can be removed, and all functionality can be shifted to the native side, reducing the overhead calling extern methods between the Ballerina and Java sides.

Suggested Improvement

A class similar to this https://github.com/ballerina-platform/module-ballerina-crypto/blob/master/native/src/main/java/io/ballerina/stdlib/crypto/BallerinaInputStream.java can be implemented in the mime native side.

Version

No response