Now it uses realpath for registering and validating DB. This means, if you have entries that has filenames differing only for case, it can deal with them as they exist.
Before this, it has miscalculated scores for such cases. For example, in case you have `/path/to/foo.lua` and `/path/to/Foo.lua`, it registers entries for each file. Now it detects accurate filename for the specified one, and removes it in validation.
* test: separate logic for utils
* fix!: register realpath for consistency
* refactor: convert fs module from class
* refactor: move db initialization phase to start()
* fix: run database:start() truly asynchronously
* fix: call each functions with async wrapping
* refactor: add types for args in command
* fix: run register() synchronously
Because vim.api.nvim_* cannot be used in asynchronous functions.
* docs: add note for calling setup() twice
* fix: run non-fast logic on next tick
* feat: add function to query the DB
* docs: add documentation for frecency.query()
* test: fix tests to run with `timestamps` property
* test: add tests for frecency.query()
* fix: fix prop attributes and names
* feat: load DB as lazily as possible
* fix: move util function to test module
* feat: use one coroutine to access DB
* test: fix to wait the table to be ready
* fix: avoid race conditions
Before this, it can run require("frecency").new() duplicatedly to wait
until frecency:setup() finishes.
