Result normalization and optimiazation attempt of relation pruning

[julianrojas87]

Main changes:

• Implement a new evaluation function for SubstringQuery tree:relation pruning based on string-similarity with query value.
• Adjust async/await structure of recursive function followChildRelations to sequentially process every level of the tree but process in parallel their content.
• Normalize result object structure for both AutocompleteClient and FuzzyAutocompleteClient.
• Include string-similarity score for prefix queries.
• Remove hardcoded node_modules and local dependency on ldfetch.