feat: support adding package_repository_resolution to manifests

[jonkeane]

Description

Now that Connect supports overriding repository resolution, we should add support to publisher to set this in manifest files. The options are lax, strict, legacy, and lockfile.

...   
"environment": { 
  "r": { 
    ...
    "package_repository_resolution": "lockfile" 
  } 
}  
...