SMTP Enhacement to READ Credentials from Vault server

[jayasimha-raghavan-unskript]

Description

Please include a summary of the change, motivation and context.
EN-5660

This PR Brings in support for

• Reading SMTP credentials from Vault
• Basic support for Office365 email sending using OAuth2

Testing

Please describe the tests that you ran to verify your changes. Please summarize what did you test and what needs to be tested e.g. deployed and tested helm chart locally.

unskript@awesome-awesome-runbooks-0:~$ unskript-ctl.sh run check --type vault --report
Running: 100%|████████████████████████████████████████████████████████| 1/1 [00:00<00:00,  2.54it/s]

╒══════════════════════════╤══════════╤════════════════╤═════════╕
│ Checks Name              │ Result   │   Failed Count │ Error   │
╞══════════════════════════╪══════════╪════════════════╪═════════╡
│ Get Vault service health │  PASS    │              0 │ N/A     │
╘══════════════════════════╧══════════╧════════════════╧═════════╛


Fetching logs...
Error: 'checks->diagnostics' section not found in '/etc/unskript/unskript_ctl_config.yaml'.
Skipping Diagnostics: No diagnostic command found. You can define them in the YAML configuration file
Uploading run artifacts to S3...
2024-08-12 03:02:47,231 - UnskriptCtlLogger - INFO - Response OK from Vault server
2024-08-12 03:02:47,231 - UnskriptCtlLogger - INFO - SMTP Credentials successfully retrieved from Vault
2024-08-12 03:02:47,574 - UnskriptCtlLogger - INFO - Slack Message was sent successfully!
INFO:botocore.credentials:Found credentials in environment variables.
2024-08-12 03:02:48,139 - UnskriptCtlLogger - INFO - Email notification sent to [email protected]
2024-08-12 03:02:48,142 - UnskriptCtlLogger - INFO - Successfully sent Email notification via AWS SES.

Checklist:

• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• Any dependent changes have been merged and published.

Documentation

Make sure that you have documented corresponding changes in this repository.