[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

experimental/grouped_convolution_tile_instances/instances/instance_run.inc

@@ -2,8 +2,6 @@
 using Builder  = ckb::ConvBuilder<SIGNATURE, ALGORITHM>;
 using Instance = Builder::Instance;
 
-auto conv = Instance{};
-bool is_supported;
-float avg_time;
-std::tie(is_supported, avg_time) = ckt::run(conv, args, inputs, outputs, s_conf);
-return std::make_tuple(is_supported, avg_time, conv.GetInstanceString());
+auto conv             = Instance{};
+ckt::RunResult result = ckt::run(conv, args, inputs, outputs, s_conf);
+return std::make_tuple(result.is_supported(), result.runtime, conv.GetInstanceString());