memory: new submodules MemArbitrator & ResourcePool (pingcap#60597)

ref pingcap#58194

Author: solotzg

pkg/util/memory/BUILD.bazel

@@ -4,9 +4,12 @@ go_library(
     name = "memory",
     srcs = [
         "action.go",
+        "arbitrator.go",
         "meminfo.go",
         "memstats.go",
+        "pool.go",
         "tracker.go",
+        "utils.go",
     ],
     importpath = "github.com/pingcap/tidb/pkg/util/memory",
     visibility = ["//visibility:public"],
@@ -30,8 +33,10 @@ go_test(
     name = "memory_test",
     timeout = "short",
     srcs = [
+        "arbitrator_test.go",
         "bench_test.go",
         "main_test.go",
+        "pool_test.go",
         "tracker_test.go",
     ],
     embed = [":memory"],
@@ -42,5 +47,6 @@ go_test(
         "//pkg/testkit/testsetup",
         "@com_github_stretchr_testify//require",
         "@org_uber_go_goleak//:goleak",
+        "@org_uber_go_zap//:zap",
     ],
 )