Add address field to capabilities

[ceelo777]

Closes #721

Description

This PR should add the ability to grab the address field from a capability.

---

For contributor use:

• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[ceelo777]

So this isn't finished @turbolent - I'm having a weird issue with the test I wrote -

`
Code Snippet:
func TestCheckCapability_address(t *testing.T) {

  t.Parallel()
  t.Run("check address", func(t *testing.T) {
	  checker, err := ParseAndCheckWithPanic(t,
		  `		  			
			  let capability: Capability = panic("")
			  let addr = capability.address
		  `,
	  )
	  require.NoError(t, err)

	  addrType := RequireGlobalType(t, checker.Elaboration, "addr")
	  require.Equal(t, sema.AddressType{}, addrType)
  })

}
`

I'm getting this error - "global type 'addr' missing" even though it seems that I'm initializing it? Not sure exactly why this is happening.

[turbolent]

Thank you for contributing this!

Looks good, just the test needs to be fixed and then it can be merged

[turbolent]

@ceelo777 Looks good, glad the test passes now. Just one last thing: Could you please add a test for the interpreter?

[ceelo777]

To be honest, I'm not sure if I did this interpreter test correctly but it passed - anything else I should add to it?

[turbolent]

The test looks good! 👍

Good idea to use the testAccount helper.
One last thing would be to check the result values, then we can merge

[turbolent]

Nice work, thanks again for adding this @ceelo777!