Cypress 10+ support

[kuceb]

Long-awaited Cypress 10+ Support for cy.tab()

• remove Ally.js dependency (abandoned)
  • closes Cannot read property '0' of null #59
  • closes Peer dependency vulnerability #37
• fix focus randomly being lost due (due to ally.js)
  • closes Sometimes the body gets focus which causes indeterminate tests #46
• upgrade to Cypress 10+, with new compatible type definitions
  • closes fix: Delay tab key by 1 frame #6
  • closes types not specified in package.json #40
• fix tabbing from focusable elements
  • fixes cy.tab() doesn't accept tabindex="-1" elements as focusable #18
  • subsumes fix: allow tabbing out of [tabindex=-1] elements #24
• follow subject changes in Cypress command chain / events sent in proper order before focus change
  • closes If a keydown handler changes focus, cy.tab will chose the wrong element #47
• fix hanging tests when used with cy.clock
  • closes Does not work with cy.clock() #42