I have read about some guides and in the progress doing the dactyl manuform, and I have seen that many people used some tape called "kapton tape" or used some shells pulled out from the wire to seperate the columns and rows of the matrix.
I want to know that is it safe to use the electrical tape for this purpose because I have read some comments said that the electrical tape will melt and cause everything around it sticky.
Don't use electrical tape. It will do exactly what you read it will do - break down over time and leave a sticky, hard to clean up mess. Just buy some kapton tape, future you will be much happier with the results.