refactor workspace symbols provider

- make it consider only symbols from the project. Previously all available symbols were scanned
- return results on empty query. Previously no results were returned due to perf problems
- reimplemented search engine using elixir_sense Matcher similar to complete
- deduplication of functions with default args added
- return containerName
- return deprecated tag if supported
- return distinct symbol kind on macros, behaviours, structs

Author: lukaszsamson