FEAT: add pathNamespaces option to search plugin

[palkan]

Summary

This option allows to dynamically choose the index path depending on the path prefixes in auto mode. Thus, different path namespace could avoid index intersection (e.g., when having multiple locales):

// complete configuration parameters
    search: {
      // ...
      // Use different indexes for path prefixes (namespaces).
      // NOTE: Only works in 'auto' mode.
      //
      // When initialiazing an index, we look for the first path from the sidebar.
      // If it matches the prefix from the list, we switch to the corresponding index.
      pathNamespaces: ['/zh-cn', '/ru-ru', '/ru-ru/v1'],

      // You can provide a regexp to match prefixes. In this case,
      // the matching substring will be used to identify the index
      pathNamespaces: /^(\/(zh-cn|ru-ru))?(\/(v1|v2))?/
    }

Closes #1303.

Array version is used here: docs.anycable.io (LIVE).

RegExp version is used here: test-prof/docs (LIVE).

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[sy-records]

👍🏻 Looks good.

[anikethsaha]

Currently we dont have test setup for plugins with the core, so I guess its good to go without tests.

LGTM

[Koooooo-7]

COOL ! thx for ur input.

@anikethsaha yup, @sy-records and I checked the simple usage test including the customized storage name, it works fine. we could consider about giving more magic about the isolated namespace in the future

[anikethsaha]

@anikethsaha yup, @sy-records and I checked the simple usage test including the customized storage name, it works fine. we could consider about giving more magic about the isolated namespace in the future

THats great. Yeah, this looks great