User defined database automation

[JiaZhou-PU]

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Merge Request Description

What issue does this change request address? Address #18

What are the changes due to this change request? Added example tables in the tutorial/use_defined folder and helper functions to implement tables in the database 3 helper functions are added to src/scripts folder:

• gen_user_defined.py is used to generate: 'user_defined_account.csv', 'user_defined_variable.csv', user_defined_algorithm.csv', and'user_defined_func.py','user_defined.sql
• run_sql is used to implement the user_defined.sql into the database.
• prepare_input is used to help ACCERT accept user-assigned input names for accounts, algorithms and variables.

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For Change Request Review

• [ ] 1. Is the merge request reference an issue? If the issue is closed, the issue close checklist shall be done.
• [ ] 2. Is the merge request reference a task? If the task is fulfilled, the task close checklist shall be done.
• [ ] 3. If any changes to the database, there must be an accompanying change to the all the linked tables.

[JiaZhou-PU]

@cbolisetti @BotrosHanna-INL Ready for review

[JiaZhou-PU]

@cbolisetti @BotrosHanna-INL really sorry to put up this huge change in one PR, I updated the document to reflect the proper changes: https://accert.readthedocs.io/en/latest/user/build_your_own.html

[JiaZhou-PU]

@cbolisetti change addressed document will change once merged