First step to support Java UDF in Doris. After this PR, we can create Java UDF in doris.
For example, we create Java UDF function by code below.
```
CREATE FUNCTION test_udf(int) RETURNS int
PROPERTIES (
"file"="file:///root/hive-udf-1.0-SNAPSHOT.jar",
"symbol"="udf.Main",
"type"="JAVA_UDF"
)
```
1. `file` indicate where user file is.
2. `symbol` for java udf means udf class in this jar.
3. `type` indicate this function is a java udf.
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