Add getters to Autocomplete suggestions priority

[martinfojtik]

This can be useful when you want to change autocomplete suggestions priority inside LSP package.

[damieng]

I think we'd either want them to override provideAutocomplete or wire these up to read config settings automatically as AutoLanguageClient's surface area is already too big. Thoughts?

[martinfojtik]

I think overriding provideAutocomplete is riskier than overriding this new getters. Because if in future we make new changes inside provideAutocomplete, it could introduce breaking change, and we will be forced to propagate that code change into other plugins. @damieng What do you think?

[damieng]

The easiest option I think is to call down to the base provideAutocomplete and then change the properties, e.g.

provideAutocomplete() {
  const provided = super.provideAutocomplete()
  provided.inclusionPriority = ... // get config
  provided.suggestionPriority = ... // get config
  provided.excludeLowerPriority = ... // get config
  return provided
}