Ssh2awsec2

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**Bugfixes**

- Fix a bug that it try to detect default system user based on AMI even when it does not exist.

**Miscellaneous**

- Only support Python3.8+, because the core dependency ``inquirer`` only support Python3.8+.
- Add support for Python3.12.

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**Features and Improvements**

- first working version.
- add the ``sshec2 ssh``, interactive ssh command.
- add the following cli commands:
- ``sshec2 ssh``
- ``sshec2 info``
- ``sshec2 clear-cache``
- ``sshec2 config show``
- ``sshec2 config set-profile``
- ``sshec2 config set-region``
- ``sshec2 config set-cache-expire``

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- First release
- Release as a placeholder on PyPI.