refactor(nvim): insert "ethersync" to each module

not to pollute lua package.loaded namespaces with general terms.

nvim-plugin/lua/ethersync/changetracker.lua

@@ -4,8 +4,8 @@
 -- SPDX-License-Identifier: AGPL-3.0-or-later
 
 local sync = require("vim.lsp.sync")
-local utils = require("utils")
-local debug = require("logging").debug
+local utils = require("ethersync.utils")
+local debug = require("ethersync.logging").debug
 
 local M = {}
 

nvim-plugin/plugin/ethersync.lua

@@ -3,9 +3,9 @@
 --
 -- SPDX-License-Identifier: AGPL-3.0-or-later
 
-local changetracker = require("changetracker")
-local cursor = require("cursor")
-local debug = require("logging").debug
+local changetracker = require("ethersync.changetracker")
+local cursor = require("ethersync.cursor")
+local debug = require("ethersync.logging").debug
 
 -- JSON-RPC connection.
 local client