Allow cancelling presence on remote nvim instances

- Add msgpack lib
- Restructure to have lib and deps folders
- Add cancellation methods and invoke remote cancellation on update

lua/lib/log.lua

@@ -0,0 +1,48 @@
+local Log = {}
+
+Log.codes = {}
+
+Log.levels = {
+    { "debug", "Comment" },
+    { "info", "None" },
+    { "warn", "WarningMsg" },
+    { "error", "ErrorMsg" },
+}
+
+function Log.new(options)
+    options = options or {}
+
+    local logger = vim.deepcopy(Log)
+    logger.options = options
+    logger.options.level = options.level
+
+    return logger
+end
+
+setmetatable(Log, {
+    __call = function(_, ...)
+        return Log.new(...)
+    end,
+})
+
+-- Initialize logger with log functions for each level
+for i = 1, #Log.levels do
+    local level, hl = unpack(Log.levels[i])
+
+    Log.codes[level] = i
+
+    Log[level] = function(self, message)
+        -- Skip if log level is not set or the log is below the configured or default level
+        if not self.options.level or self.codes[level] < self.codes[self.options.level] then
+            return
+        end
+
+        vim.schedule(function()
+            vim.cmd(string.format("echohl %s", hl))
+            vim.cmd(string.format([[echom "[%s] %s"]], "presence.nvim", vim.fn.escape(message, '"')))
+            vim.cmd("echohl NONE")
+        end)
+    end
+end
+
+return Log