Describe the bug

The DataDog Dashboard / Monitor format supported by v0.0.1 is still the one supported in late 2022 by PR laurmurclar#62, created for the provider version 3.3.1. But the current version is 3.46.0, with many new fields in the schema, that need to be supported.

Fixes needed

• identify all new keywords and type changes for support
  • dashboard
    • top-level
      • tags: string list
    • widget definition
      • last_triggered_format: string (relative) , undocumented
      • show_priority: boolean
      • show_status: boolean, undocumented
      • show_title: boolean
      • timeseries_background: string
    • formulas
      • cell_display_mode: string (number or bar)
      • number_format: block of strings, undocumented
      • style
  • request
    • columns block
    • query
      • indexes: string list
      • query_string: string
      • storage: string, private beta in 3.46.0
• identify all deprecations and removals
• apply matching changes, creating test cases for both