Fixed out of memory when uploading big file

[zc-devs]

Closes #259.

Tests with 2GB Zip file.

spring.servlet.multipart.max-file-size=3GB
spring.servlet.multipart.max-request-size=3GB

Before patch:

After patch:

[zc-devs]

https://stackoverflow.com/questions/49304767/the-request-was-rejected-because-its-size-spring-tomcat https://spring.io/guides/gs/uploading-files/ https://stackoverflow.com/questions/51893585/java-lang-outofmemoryerror-java-heap-space-while-uploading-1-gb-file-in-spri