R1:ab0f09d115f3

Style tweaks for Conduit API console

Summary:
- Use pretty JSON formatter for human-readable Conduit output
- Fix some whitespace issues with format/layout.

Test Plan:
- Looked at conduit console.
- Looked at human-readable output of several calls.

Reviewed By: codeblock
Reviewers: codeblock, jungejason, tuomaspelkonen, aran
CC: aran, codeblock
Differential Revision: 740