4.x: Different defaults for HTTP/1.1 limits

[tomas-langer]

Limits in 3.x (in io.helidon.webserver.SocketConfiguration.Builder):

 private int maxHeaderSize = 16384;
private int maxInitialLineLength = 4096;

in 4.x, we have the limits set to (in io.helidon.webserver.http1.Http1ConfigBlueprint):

@Option.DefaultInt(16384) // correct
int maxHeadersSize(); 

@Option.DefaultInt(2048) // should be 4096
int maxPrologueLength();

Other defaults should be checked as well and aligned where the semantics is the same.