Let's generate and display meaningful parsing errors.

[bushwallyta271828]

TODO:

• Update immediate-constraint-dependencies and display-constraint-parse to use "never" to allow removal of parseType errors.
• Update parse-formula.tsx function descriptions to specify that we no longer throw null.
• Update parse-formula.tsx functions to replace "return null" with meaningful error messages.
• Update setClaimText to save parse error messages.
• Update getDisplayData to access saved parse error messages, save new display error messages, and return appropriate displayText.
• Update addClaim to handle new attribute on constraint claims.

[bushwallyta271828]

TODO:

• Update immediate-constraint-dependencies and display-constraint-parse to use "never" to allow removal of parseType errors.
• Update parse-formula.tsx function descriptions to specify that we no longer throw null.
• Update parse-formula.tsx functions to replace "return null" with meaningful error messages.
• Update setClaimText to save parse messages.
• Update getDisplayData to access saved parse messages and return appropriate displayText.
• Update addClaim to handle new type for parse attribute.

[bushwallyta271828]

Using "never" doesn't seem to be worth it. I don't understand how this is happening but I need to move on right now. I backtracked, created a new branch, and created a new pull request.