Fix grid track sizing for fit-content(percentage) and for items spanning percentage gaps (#335)

* Add tests for child spanning two max-content tracks with gaps between the tracks

* Recompute available_grid_space and node_inner_size after initial track sizing rounds WIP

* Suspect fix WIP

* Use computed column sizes for first iteration of row track size computation

* Don't limit the distribution of min-content sizes by the argument of a fit-content sizing function

* Simplify fit-content tests

* Resolve percentage track sizing function against node_inner_size rather than available_grid_space

* Add disabled percentage fit-content test

* Percentage fit content limits WIP

* Distribute growth_limit changes (broken)

* Simplify fit-content percent definite test

* Apply fit-content limit to growth limits

* When distributing space to growth_limit use base_size as affected property if growth_limit is infinite

* Add min_content and max_content variants of fit-content percent definite tests

* Add percent indefinite fit content tests

* Remove debug logs

* Remove commented out code

* Fix clippy lints

* Improve documentation of callback functions in distribute_item_space_to_base_size

* Remove useless code

Co-authored-by: Alice Cecile <[email protected]>

Author: nicoburns