Trace: include `line_end` field in json-v1 format

After !6954 (merged) got merged, it has become easier for tools to get full stack-traces for runtime traces of a CMake program. The trace information already included in the JSON objects (line number, source file path) allows tools that display these stack traces to print the CMake source code associated to them. However, CMake commands may spawn multiple lines, and the JSON information associated to a trace only contains the line in which the command started, but not the one in which it ended. If tools want to print stack traces along the relevant source code, and they want to print the whole command associated to the stack frame, they will have to implement their own CMake language parser to know where the command ends.

In order to simplify the life of those who want to write tooling for CMake, this commit adds a line_end field to the json-v1 trace format. If a given command spans multiple lines, the line_end field will contain the line of the last line spanned by the command (that of the closing parenthesis associated to the command)

Fixes: #23205 (closed)
Topic-rename: trace-line-range