Autocompletion fallback

[catreedle]

Contributor checklist

• This pull request is on a separate branch and not the main branch
• I have tested my code with the ./gradlew lintKotlin detekt test command as directed in the testing section of the contributing guide

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Description

Add fallback autocompletion from nouns table when autocomplete lexicon Trie is unavailable.

• Changes in AutocompletionDataManager functions to handle fallback, loadWords function loads and caches all the nouns distinctly for autocompletion
• Fix db name in DynamicDbHelper
• Small change in GeneralKeyboardIME to pass the column names of nouns to loadWords

Related issue

• Use nouns table for alphabetical autocompletions #552

[github-actions]

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[github-actions]

Maintainer Checklist

The following is a checklist for maintainers to make sure this process goes as well as possible. Feel free to address the points below yourself in further commits if you realize that actions are needed :)

• Tests for changes have been written and the unit test, linting and formatting workflows within the PR checks do not indicate new errors in the files changed

  • Tests may need to be reran as they're at times not deterministic

• The CHANGELOG has been updated with a description of the changes for the upcoming release and the corresponding issue (if necessary)