add inner spacing to inline objects (non-empty) - BREAKING

[brodycj]

I think this would be much cleaner. I would be happy to make this optional (my time permitting), if needed.

example from tests/examples/sorted/inline-default.toml:

'aalist' = { c = "test", a = "another test" } # list comment

multi-line example from tests/examples/sorted/inline-default.toml:

[a]
test = [
  { x = [
      "foo",
      "bar"
    ], a = [
      ""
    ] },
  { y = [
      "foo",
      "baz"
    ] }
]

NOTE that I would personally care the most about the single-line object case, no need for multi-line object formatting in my work at this point.

[brodycj]

I think the multi-line object formatting could use some improvement:

• closing curly-brace should be out-dented on the next line
• should start a new line after the opening curly-brace
• should be able to add trailing comma after closing curly-brace, in a similar style to using --trailing-comma-inline-array with inline arrays, for multi-line case only

But this is not a high-priority for me, single-line object formatting with the proposed inner spacing is what I care about at this point.

Thanks in advance for the consideration.