Changes

Summary

1. Add supplier based FileUpload (#2508) (commit: 4cbf9f5) (details)

Commit 4cbf9f51acf0f6ec630d257fa693e2b6e418c1cc by noreply Add supplier based FileUpload (#2508) (commit: 4cbf9f5)
	src/main/java/net/dv8tion/jda/internal/utils/requestbody/BufferedRequestBody.java
	src/main/java/net/dv8tion/jda/internal/utils/requestbody/TypedBody.java
	src/main/java/net/dv8tion/jda/api/utils/FileUpload.java (diff)
	src/main/java/net/dv8tion/jda/internal/utils/requestbody/DataSupplierBody.java
	src/main/java/net/dv8tion/jda/internal/utils/IOUtil.java (diff)
	src/main/java/net/dv8tion/jda/internal/utils/BufferedRequestBody.java