[predictor] move fblearner/predictor to platform009
Summary: This is to test predictor on platform009
Test Plan:
```
fbpkg build -E fblearner/predictor
fbpkg build -E fblearner/predictor_proxy
```
# Performance test
## ServiceLab experiments
https://fburl.com/servicelab/p2xo4c85
## Perf A/B test
perf_b is platform-009
https://fburl.com/ods/59kdhdf9
perf_a is platform-09
https://fburl.com/ods/gjctzpe3
Differential Revision: D20552379
fbshipit-source-id: d6d9094aedfb2c1db623d44108627e8e00dde47e
