feat(arena): optimize data frame deserialization (#453)

* feat(arena): optimize data frame deserialization

* fix: no serialization for response

feat: support nexmark q13 on cloud functions (#405)

* feat: support nexmark q13 on cloud functions

* fix: we cannot infer schema for side input

This is because inferred schema's field type could be different. For example, Int32 and Int64 are different.

* fix: add side_input_schema()

* fix: unused variable: `ctx`

* fix: use base64 to encode schema

Merge pull request #337 from flock-lab/zhenghang-cmsc624

added q6_v3

Merge branch 'master' of https://github.com/DSLAM-UMD/ServerlessCQ