Resize header cells to match column width

[AdamWard1995]

This project uses semver, please check the scope of this pr:

• [ ] #none# - documentation fixes and/or test additions
• [ ] #patch# - backwards-compatible bug fix
• [X] #minor# - adding functionality in a backwards-compatible manner
• [ ] #major# - incompatible API change

This change removes the fixed table layout from the frost-table component and instead uses a flexbox layout. The table body is placed in a scroll for when the table is not allocated enough height to display all of it. The header cells get resized to match the corresponding table body column's width, which is the main purpose of the change.

CHANGELOG

• Updated frost-table to use a flexbox layout instead of a fixed table layout and wrap the table body in a frost-scroll

[coveralls]

Changes Unknown when pulling 68a44a5ab5d8f64494e44f255c1192f00547c37b on AdamWard1995:tableHeaders into on ciena-frost:master.

[coveralls]

Changes Unknown when pulling 141161c116d1bd0837a673fabe045cf1af7bca78 on AdamWard1995:tableHeaders into on ciena-frost:master.

[coveralls]

Changes Unknown when pulling 10163f06aff29b4828048a351aa357aa66c15ca4 on AdamWard1995:tableHeaders into on ciena-frost:master.

[sglanzer-deprecated]

Approved