feat(#18): add `silence_info` and created `logger` to write to a log file

[AlejandroSuero]

Changes made

• [x] Added logger inspired by none-ls but without the use of plenary.nvim.
• [x] Made changes to the config to ease the use of a logger and validate the config and add user level settings to control when and what to show.
• [x] Changed the files that printed information to use logger with the level warning.
• [x] Made corresponding changes in the README.

Demo of the changes

• With silence_info and debug on:

https://github.com/supermaven-inc/supermaven-nvim/assets/71392160/0be8797b-d6fa-4cb2-b6bd-beae5c57539b

• With silence_info and debug off:

https://github.com/supermaven-inc/supermaven-nvim/assets/71392160/d3300bde-9a8d-420d-9dd3-3a85187f479a

How to use the logger

1. Import the logger local log = require("supermaven-nvim.logger").
2. Decide which level of information you want the user to see.
   • Levels:
   • "error": Always shows.
   • "warn": Always shows.
   • "info": Always shows. (like print)
   • "debug": shows if debug is true.
   • "trace": shows if silence_info is true.
   • "off": logger turned off completely log_level option is set too "off".
3. If you have them set to debug = true or/and silenced info, :SupermavenShowLog to show the log file with timestamps and the level off error.
4. If you want to reset or clear the log file, :SupermavenClearLog.

Closes #18 Closes #42

[joaomendoncaa]

Hey @sm-victorw, if you could take a look at this PR to potentially move it forward it would be amazing since it solves both #42 and #4 (which are both small but annoying quirks).

Sorry for the bump but it was in hopes you had custom notifications and this wasn't on your backlog.

Appreciate your time.

[sm-victorw]

@AlejandroSuero would it be possible to have the verbosity for the logger controlled through a single config option, particularly log_level? Having 3 separate boolean values to control what get printed feels rather unintuitive.

I have in mind that e.g. log_level taking values "off", "silent", "warn", or "debug" or something similar would be more manageable

[AlejandroSuero]

@sm-victorw I made the changes so now it just needs to be

-- supermaven opts
{
  keymaps = {
    -- ...
  },
  log_level = "off" -- based on `vim.log.levels[log_level:upper()]`
}

if off silence all expect warnings and errors.