external mismatch rule checks peer deps

[cheesehary]

External mismatch rule will check peer deps for version enforcement.

1. When the peer dep only has one version, e.g "foo": "^1.0.0", it'll fix to the most common version just like other dev/prod deps
2. When the peer dep has multiple versions, e.g "foo": "^1.0.0 || ^2.0.0", the fix varies based on allowedDependencyVersions:
   a) if multiple versions are configured in allowedDependencyVersions, like ["^2.0.0", "^3.0.0"], then it'll fix to "foo": "^2.0.0 || ^3.0.0"
   b) if no versions are configured in allowedDependencyVersions, then it'll fix to the most common version; and if there's no most common version, it'll fix to the first version. e.g "foo": "^1.0.0 || ^2.0.0" => "foo": "^1.0.0"

Testing plan:
link the package to atlassian-frontend and run yarn manypkg fix in different cases.

1. in @atlaskit/docs, bump peer dep "react" to "^18.0.0". It should get clamped to "^16.8.0"
2. in @atlaskit/docs, bump peer dep "react" to "^16.8.0 || ^18.0.0". It should get clamped to "^16.8.0"
3. in root package.json, set allowedDependencyVersions to add "react": ["^16.8.0", "^18.0.0"]; in @atlaskit/docs, bump peer dep react to "^17.0.0 || ^18.0.0". It should get clamped to "^16.8.0 || ^18.0.0"
4. in root package.json, set allowedDependencyVersions to add "react": ["^16.8.0", "^18.0.0"]; in @atlaskit/docs, bump peer dep react to "^18.0.0". It should pass the check
5. in @atlaskit/docs, add peer dep "simple-git": "^1.0.0". It should get clamped to "^3.5.0"
6. in @atlaskit/docs, add a new peer dep "smallest": "^1.0.0". It should pass the check
7. in @atlaskit/docs, add a new peer dep "smallest": "^1.0.0 || ^2.0.0". It should get clamped to "^1.0.0"