[CK_BUILDER] conv bwd weight testing (#3618)

* ck-builder: restructure testing conv

In order to prepare for bwd of conv testing, this commit moves some
files and types around so that we can reuse ckt::Args for both forward
and backwards convolution.

* ck-builder: decouple fwd_ck.hpp and fwd_reference.hpp from fwd.hpp

This will allow us to more easily include fwd.hpp from backwards
definitions, which is required for initializing bwd values.

* ck-builder: fix layout of test_ckb_conv_bwd_weight_xdl_cshuffle_v3

Turns out that the supplied layout isn't actually supported...

* ck-builder: ck and reference conv integration for bwd weight

* ck-builder: ck bwd weight execution test

* ck-builder: ckt::run support for ck-tile bwd weight

* ck-builder: ck tile bwd weight execution test

* ck-builder: extra debug printing in MatchesReference

* ck-builder: make ckt::run return RunResult

This type is more convenient than std::tuple, as it will allow us to
use google test matchers with this in the future.

* ck-builder: RunResult matcher

Using EXPECT_THAT(..., SuccessfulRun()) will generate a check and a nice error
message about how and why running an algorithm failed.

* ck-builder: doc fixes

* ck-builder: add missing headers

[ROCm/composable_kernel commit: cc75948d1c]

experimental/builder/test/unit_conv_fwd_testing.cpp

@@ -3,7 +3,7 @@
 
 #include "impl/conv_signature_types.hpp"
 #include "testing_utils.hpp"
-#include "ck_tile/builder/testing/conv_fwd.hpp"
+#include "ck_tile/builder/testing/conv/fwd.hpp"
 #include "ck_tile/builder/testing/tensor_foreach.hpp"
 #include <gtest/gtest.h>
 #include <gmock/gmock.h>