refactor(git): make the git module self-contained under git.util

lua/git/cmd.lua

@@ -1,7 +1,6 @@
 local git = require("git")
-local log = require("log")
 local repo = require("git.repo")
-local util = require("util")
+local util = require("git.util")
 
 local M = {}
 
@@ -23,7 +22,7 @@ local cached_cmds
 ---@param result vim.SystemCompleted
 local function populate_cached_cmds(result)
     if result.code ~= 0 then
-        log.error("git --list-cmds failed: %s", vim.trim(result.stderr or ""))
+        util.error("git --list-cmds failed: %s", vim.trim(result.stderr or ""))
         return
     end
     cached_cmds = {}
@@ -140,7 +139,7 @@ local function run_in_split(worktree, args, conf)
             vim.bo[buf].modifiable = false
             vim.bo[buf].modified = false
             if obj.code ~= 0 then
-                log.error(
+                util.error(
                     "git %s failed: %s",
                     args[1] or "",
                     vim.trim(obj.stderr or "")
@@ -216,7 +215,7 @@ end
 function M.run(args)
     local _, worktree = repo.resolve_cwd()
     if not worktree then
-        log.warning("not in a git repository")
+        util.warning("not in a git repository")
         return
     end