SE-0483: `InlineArray` Literal Syntax

[xwu (Xiaodi Wu)]

@austintatious

This helps support the idea that we don't need our Syntax to be precisely English but rather just enough to guide the reader and new learners.

It also opens up a possible future direction for a non-empty array, which clearly should have the sugar [some of UInt8]. This can be disambiguated from an opaque element type, which can also be supported in composition: [some of some BinaryInteger].