[SR-4190] Text position and span tests

[bitjammer]

Previous ID	SR-4190
Radar	None
Original Reporter	@bitjammer
Type	Bug

Additional Detail from JIRA

Votes	0
Component/s	Compiler
Labels	Bug, Syntax, Test
Assignee	@bitjammer
Priority	Medium

md5: f36e531d397ed4947aa333f609d8d625

Issue Description:

Source file -> parse -> lib/AST -> transform -> lib/Syntax -> Syntax/ASTNode map

For each entry in the map, check that { source file, offset, line, column } are the same for each pair.

[AnthonyLatsis]

libSyntax was removed in #62145 and succeeded by swift-syntax.