Single-file debugging support in DBI and createdump (#67163)

Single-file debugging support in DBI and createdump (#67163)

* Add single-file debugging to DBI

Add new CoreCLRCreateCordbObjectEx2 API that takes the DAC module path instead of
assuming the DAC module is in the same directory as DBI.

* Add createdump single-file support

Use module name from /proc/<pid>/maps when the DSO module name is empty.

Make sure the DotNetRuntimeInfo block is in the core dump.

* Fix bug with spaces in module names in createdump on Linux

* Code review feedback - only check for singlefile if --singlefile is passed