refactor(proposal table): update table columns & dummy data

[Robert303V]

Developer: Robert Vermeulen

Closes #41

Pull Request Summary

Updated table columns & dummy data to reflect proposalSchema in "src/database/proposalSchema.ts"

Added two properties to proposalSchema: meeting_date & public_comment_end_date

Allowed for sorting by any column containing dates, or by name

Modifications

"src/database/proposalSchema.ts" -> added meeting_date (Date) and public_comment_end_date (Date) as arguments of IProposal object

"src/components/proposalTable.tsx" -> changed the dummy data to be of type IProposal not of type Payments

"src/lib/tableColumns.tsx" -> changed the columns to reflect the IProposal object

Testing Considerations

{list out what you have tested and what the reviewer should verify}

Pull Request Checklist

• [X ] Code is neat, readable, and works
• [X ] Comments are appropriate
• [X ] The commit messages follows our guidelines
• [X ] The developer name is specified
• [X ] The summary is completed
• [X ] Assign reviewers

Screenshots/Screencast

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