[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_includes.inc

@@ -1,5 +1,6 @@
 #include "../../builder/test/utils/ckb_conv_tile_test_configs.hpp"
-#include "ck_tile/builder/testing/conv_fwd_ck_tile.hpp"
+#include "ck_tile/builder/testing/conv/fwd.hpp"
+#include "ck_tile/builder/testing/conv/ck_tile.hpp"
 
 namespace ckb = ck_tile::builder;
 namespace ckt = ck_tile::builder::test;