[CARBONDATA-1599] Optimize pull request template
[CARBONDATA-1599] Optimize pull request template

Optimize pull request template for reminding contributors to provide full information.

This closes #1422

jackylk/incubator-carbondata,zzcclp/carbondata,ravipesala/incubator-carbondata,manishgupta88/carbondata,sgururajshetty/carbondata,manishgupta88/incubator-carbondata,HuaweiBigData/carbondata,manishgupta88/incubator-carbondata,zzcclp/carbondata,HuaweiBigData/carbondata,manishgupta88/carbondata,ravipesala/incubator-carbondata,HuaweiBigData/carbondata,jatin9896/incubator-carbondata,zzcclp/carbondata,jackylk/incubator-carbondata,ravipesala/incubator-carbondata,manishgupta88/carbondata,manishgupta88/incubator-carbondata,jatin9896/incubator-carbondata,jatin9896/incubator-carbondata,sgururajshetty/carbondata,manishgupta88/incubator-carbondata,jackylk/incubator-carbondata,jackylk/incubator-carbondata,manishgupta88/carbondata,ravipesala/incubator-carbondata,zzcclp/carbondata,sgururajshetty/carbondata,zzcclp/carbondata