Adds pyatlan-formatter

I observed that the pre-commit script only executes on Git-tracked files.
However, this poses an issue when we generate new modules and attempt to run
the formatter on them, as it requires tracking (staging) those files before running
`pre-commit run --all-files`. This adds unnecessary steps for users who may not be familiar with pre-commit.

To address this, I propose the addition of a simple shell script,
`./pyatlan-formatter`, which can handle formatting tasks for both tracked and untracked .

pyatlan-formatter

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+# Get the filenames of changed files and untracked files
+changed_files=$(git diff --name-only HEAD)
+untracked_files=$(git ls-files --others --exclude-standard)
+
+# Combine changed and untracked files
+all_files="${changed_files}
+${untracked_files}"
+
+# Pass the filenames to pre-commit run --files
+echo "$all_files" | tr '\n' '\0' | xargs -0 pre-commit run --files