[DWARFLinker][NFC] Change interface of DWARFLinker to specify accel table kinds explicitly.

Currently, DWARFLinker receives kind of accel tables as predefined sets:

```
  Apple,   ///< .apple_names, .apple_namespaces, .apple_types, .apple_objc.
  Dwarf,   ///< DWARF v5 .debug_names.
  Default, ///< Dwarf for DWARF5 or later, Apple otherwise.
  Pub,     ///< .debug_pubnames, .debug_pubtypes
```

This patch removes implicit sets of tables(Default, Dwarf) and allows to ask for several sets:

```
  Apple,     ///< .apple_names, .apple_namespaces, .apple_types, .apple_objc.
  Pub,       ///< .debug_pubnames, .debug_pubtypes
  DebugNames ///< .debug_names.
```

It allows seamlessness adding more accel tables in the future: .gdb_index, .debug_cu_index...
Doing things that way, DWARFLinker will be independent of consumers' requirements.
f.e. dsymutil and llvm-dwarfutil may have different variants for Default set
(so, instead of implementing these differencies inside DWARFLinker it could be
implemented in the corresponding module).

Differential Revision: https://reviews.llvm.org/D132371