conch-parser: include Python binding in autocargo
conch-parser: include Python binding in autocargo

Summary:
This makes the conch-parser Python extension included in the generated
Cargo.toml workspace members. It might fix the following `setup.py`
build error:

  building 'conch_parser' library extension
  error: current package believes it's in a workspace when it's not:
  current:   /temp/fbcode_builder_getdeps/shipit/eden_scm/eden/scm/edenscmnative/conch_parser/Cargo.toml
  workspace: /temp/fbcode_builder_getdeps/shipit/eden_scm/eden/scm/Cargo.toml
  this may be fixable by adding `edenscmnative/conch_parser` to the `workspace.members` array of the manifest located at: /data/sandcastle/temp/fbcode_builder_getdeps/shipit/eden_scm/eden/scm/Cargo.toml
  Alternatively, to keep it out of the workspace, add the package to the `workspace.exclude` array, or add an empty `[workspace]` table to the package's manifest.

Differential Revision: D35759558

fbshipit-source-id: 2d07285d81092cca10c0fc127c935b5d370f2891

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