[105] Add date of birth field to search form

[AbigailMcP]

Context

As a user I want to be able to search by last name and date of birth and see whether there are any matching records.

Changes proposed in this pull request

• Add date of birth field to form
• Validate that the date of birth is a valid date via custom validator DayMonthYearValidator
• Create InvalidDate class that returns a date-like-object which can be used to re-populate
  the form if an invalid date is given
• Include date_of_birth where-clause in includes_record? method on ChildrensBarredListEntry
• Display date_of_birth supplied by user in both Record found and No record found pages

Other:

• Add breadcrumbs to results pages
• Update curly apostrophes

Guidance to review

Form with date of birth field:

Form with presence errors:

Form with invalid date error:

Record found page including date of birth and breadcrumbs:

No record found page including date of birth and breadcrumbs:

Link to Trello card

https://trello.com/c/HrfZNW9S/105-search-interface-date-of-birth-field

Checklist

• Attach to Trello card
• Rebased main
• Cleaned commit history
• Tested by running locally

[steventux]

💯