Remove stack traces when debug mode is not enabled

[sannya-singal]

This PR enhances the usability and devX of the awslocal by logging stack traces only when --debug is passed and displaying only error messages by default, matching awscli behavior.

Current Behaviour

sannyasingal@Sannyas-MacBook-Pro ~ % CUSTOMIZE_ACCESS_KEY=1 AWS_ACCESS_KEY_ID=444444444444  awslocal kms create-key 
Traceback (most recent call last):
  File "/Users/sannyasingal/.pyenv/versions/3.11.9/bin/awslocal", line 87, in main
    import awscli.clidriver  # noqa: F401
    ^^^^^^^^^^^^^^^^^^^^^^^
ModuleNotFoundError: No module named 'awscli'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/sannyasingal/.pyenv/versions/3.11.9/bin/awslocal", line 268, in <module>
    main()
  File "/Users/sannyasingal/.pyenv/versions/3.11.9/bin/awslocal", line 89, in main
    return run_as_separate_process()
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/sannyasingal/.pyenv/versions/3.11.9/bin/awslocal", line 151, in run_as_separate_process
    env_dict = prepare_environment()
               ^^^^^^^^^^^^^^^^^^^^^
  File "/Users/sannyasingal/.pyenv/versions/3.11.9/bin/awslocal", line 104, in prepare_environment
    credentials = session.get_credentials()
                  ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/sannyasingal/.pyenv/versions/3.11.9/lib/python3.11/site-packages/boto3/session.py", line 201, in get_credentials
    return self._session.get_credentials()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/sannyasingal/.pyenv/versions/3.11.9/lib/python3.11/site-packages/botocore/session.py", line 515, in get_credentials
    ).load_credentials()
      ^^^^^^^^^^^^^^^^^^
  File "/Users/sannyasingal/.pyenv/versions/3.11.9/lib/python3.11/site-packages/botocore/credentials.py", line 2074, in load_credentials
    creds = provider.load()
            ^^^^^^^^^^^^^^^
  File "/Users/sannyasingal/.pyenv/versions/3.11.9/lib/python3.11/site-packages/botocore/credentials.py", line 1149, in load
    credentials = fetcher(require_expiry=False)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/sannyasingal/.pyenv/versions/3.11.9/lib/python3.11/site-packages/botocore/credentials.py", line 1189, in fetch_credentials
    raise PartialCredentialsError(
botocore.exceptions.PartialCredentialsError: Partial credentials found in env, missing: AWS_SECRET_ACCESS_KEY

Expected Behaviour:

sannyasingal@Sannyas-MacBook-Pro ~ % CUSTOMIZE_ACCESS_KEY=1 AWS_ACCESS_KEY_ID=444444444444  awslocal kms create-key

Partial credentials found in env, missing: AWS_SECRET_ACCESS_KEY

[github-actions]

Smoke Tests

 6 files  ±0  12 suites  ±0   3m 22s ⏱️ -1s
 4 tests ±0   4 ✅ ±0  0 💤 ±0  0 ❌ ±0 
24 runs  ±0  24 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 45827c9. ± Comparison against base commit 11c02f6.

♻️ This comment has been updated with latest results.

[k-a-il]

There is one minor issue with different versions defined in setup.py and README.m. Please fix before merging, otherwise LGTM