Fishtown/add new streams

[cosimon]

Copied from https://github.com/singer-io/tap-codat/pull/8 to get circle to run

Description of change

This PR adds net-new functionality to tap-codat and fixes some existing issues that affected production issues with the tap. Further, endpoints which support incremental loading are now incremental.

Functional changes:

• Retry requests which fail with a 500, 501, or 502 error code
• Added fields to the Accounts stream:
  • description
  • fullyQualifiedCategory
  • modifiedDate
  • sourceModifiedDate
• Added companyId field to Payment Allocations Stream
• Migrated Bank Statement Lines from a subfield of Bank Statements to its own stream
  • Bank Statements can have arbitrarily long line items lists which exceeded Stitch's 4mb API integration limit. Each line item is now its own row in the Bank Statement Lines table.

New streams

• Added Bills stream
• Added Bill Payments stream
• Added Connections stream
• Added Events stream
• Added Items stream
• Added Journal Entries stream
• Added Tax Rates stream
• Added Bank Accounts stream
• Added Bank Account Transactions stream

Incrementalized streams:

• Accounts
• Bank Statements
• Bills
• Credit Notes
• Customers
• Payments
• Suppliers
• Connections
• Bill Payments
• Invoices
• Journal Entries
• Items
• Tax Rates

Manual QA steps

A Stitch client has been running the tap from this branch in production and has empirically verified the accuracy of the data in new and modified streams.

Risks

• The change to the Bank Statement Lines stream represents a breaking changes for users who make use of this table.

Rollback steps

• revert this branch

Thanks, and please let me know if you have any questions about the nature of this PR.