box: support brackets in name resolution for Lua calls

Fefactor lua name resolution, simplify and comment.
Add an ability to specify path with brackets, for example in
'box.space[512]:get' or 'box.space["test"]:get'.
Only literals (strings and numbers) are supported.

Closes #8604

@TarantoolBot document
Title: square brackets in procedure resolution for Lua calls

Square brackets are now supported in Lua call procedure resolution. This is
applicable to `net.box` connection objects `call` method as well as
`box.schema.func.call`.

Examples of function calls with square brackets can be found in the test to
this patch.