Print R2RDump Statistics in the Output File Instead of Console

[ivdiazsa]

This PR fixes #49249. When running R2RDump.exe/dll, the Fixup count statistics were shown in the console at the end. The intended behavior was to add them at the end of the resulting --out file instead.

This PR addresses this issue, and adds a little useful feature. Instead of hardcoding the table's format, its padding is now generated from the contents that will be printed in it. This allows it to always display properly, regardless of the fields and numbers stored, and therefore is now a self-maintaining component.

Before this change:

=========== Eager fixup counts across all methods ===========
                      Fixup | Count
         Verify_FieldOffset | 655074
                 TypeHandle | 243894
          Verify_TypeLayout | 122611
               StringHandle | 106559
           MethodDictionary |  5465
      IndirectPInvokeTarget |  1007
             TypeDictionary |   950
Check_InstructionSetSupport |   736
               MethodHandle |   277
              PInvokeTarget |    88
       MethodEntry_DefToken |    12
                FieldHandle |     8
-----------------------------------
                      Total | 1136681
=============================================================

After this change:

=========== Eager fixup counts across all methods ===========
                      Fixup |   Count
         Verify_FieldOffset |  655074
                 TypeHandle |  243894
          Verify_TypeLayout |  122611
               StringHandle |  106559
           MethodDictionary |    5465
      IndirectPInvokeTarget |    1007
             TypeDictionary |     950
Check_InstructionSetSupport |     736
               MethodHandle |     277
              PInvokeTarget |      88
       MethodEntry_DefToken |      12
                FieldHandle |       8
-------------------------------------
                      Total | 1136681
=============================================================

[trylek]

Very nice, thank you!

[trylek]

Non-blocking nit - you could rename this variable to "fixupPadding", initialize it to 5 and delete the line 595. If you're more comfortable with your formulation, feel free to keep it.