fix universal: make ForwardLike conform to the standard

[ddvamp]

Fixes #1202

(Optional) Additionally, added support for && members in USERVER_IMPL_STRUCT_SUBSET_(REF_)MAP

[ddvamp]

Test has been run on std::forward_like from gcc and clang.

[apolukhin]

LGTM

[robot-magpie]

Many thanks for the PR! @apolukhin is now importing your pull request into our internal upstream repository.

[apolukhin]

@ddvamp clang-tidy complains:

taxi/uservices/userver/universal/src/utils/struct_subsets_test.cpp:302:15: error: 'deps' used after it was moved [bugprone-use-after-move,-warnings-as-errors]
  302 |     EXPECT_EQ(deps.a.value, 41);
      |               ^
taxi/uservices/userver/universal/src/utils/struct_subsets_test.cpp:301:21: note: move occurred here
  301 |     SmolDeps smol = std::move(deps);
      |                     ^
taxi/uservices/userver/universal/src/utils/struct_subsets_test.cpp:315:15: error: 'deps' used after it was moved [bugprone-use-after-move,-warnings-as-errors]
  315 |     EXPECT_EQ(deps.a.value, 41);
      |               ^
taxi/uservices/userver/universal/src/utils/struct_subsets_test.cpp:314:21: note: move occurred here
  314 |     SmolDeps smol = std::move(deps);
      |                     ^
taxi/uservices/userver/universal/src/utils/struct_subsets_test.cpp:359:15: error: 'deps' used after it was moved [bugprone-use-after-move,-warnings-as-errors]
  359 |     EXPECT_EQ(deps.a.value, 41);
      |               ^
taxi/uservices/userver/universal/src/utils/struct_subsets_test.cpp:358:24: note: move occurred here
  358 |     SmolDepsRef smol = std::move(deps);
      |                        ^
taxi/uservices/userver/universal/src/utils/struct_subsets_test.cpp:372:15: error: 'deps' used after it was moved [bugprone-use-after-move,-warnings-as-errors]
  372 |     EXPECT_EQ(deps.a.value, 41);
      |               ^
taxi/uservices/userver/universal/src/utils/struct_subsets_test.cpp:371:24: note: move occurred here
  371 |     SmolDepsRef smol = std::move(deps);
      |                        ^

Please fix (for example just rever the macro changes)