Apply rustfmt, clippy suggestions, and other cleanups (#44)

- Applied most clippy suggestions to bring launcher and router code up
to standards
- Exceptions added to avoid having to refactor a few things:
`#![allow(clippy::type_complexity, clippy::result_large_err)]`
- Added `rustfmt.toml` with settings to organize imports specifically
- Formatted code with rustfmt
- Added the generated code paths to `.gitignore`

Signed-off-by: Daniel Clark <daniel.clark@ibm.com>
Co-authored-by: Daniel Clark <Daniel.Clark@ibm.com>

.gitignore

@@ -1,3 +1,4 @@
 .idea
 target
-router/src/pb/
+router/src/pb
+router/client/src/pb