Updated DAO/DTO/model_enum with discussion updates

[jcadam14]

Closes #29

As mentioned in the story, updated the following:

• new FilingState called FILING_INSTITUTION_APPROVED
• change the FilingType enum to be MANUAL (the only one we'll have for MVP right now)
• add confirmation_id to SubmissionDAO
• add contact_id to FilingDAO

The alembic scripts were already updated to include these updates.

[github-actions]

Coverage report

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File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
src
__init__.py
main.py
src/entities/models
dao.py
dto.py
model_enums.py
Project Total

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[lchen-2101]

Let's go with this for now. We'll probably need a separate model for the contact_info.