feat(//cpp/api/lib): New runtime only library

Users now can simply ship the runtime library with their compiled
trtorch programs instead of the full compiler. The runtime will load
into pytorch on DL_OPEN, LD_PRELOAD or torch.ops.load

Signed-off-by: Naren Dasan <naren@narendasan.com>
Signed-off-by: Naren Dasan <narens@nvidia.com>

BUILD

@@ -40,7 +40,10 @@ pkg_tar(
     package_dir = "lib/",
     srcs = select({
         ":windows": ["//cpp/api/lib:trtorch.dll"],
-        "//conditions:default": ["//cpp/api/lib:libtrtorch.so"],
+        "//conditions:default": [
+            "//cpp/api/lib:libtrtorch.so",
+            "//cpp/api/lib:libtrtorchrt.so",
+        ],
     }),
     mode = "0755",
 )

cpp/api/lib/BUILD

@@ -1,5 +1,15 @@
 package(default_visibility = ["//visibility:public"])
 
+cc_binary(
+    name = "libtrtorchrt.so",
+    srcs = [],
+    deps = [
+        "//core/runtime:runtime"
+    ],
+    linkstatic = True,
+    linkshared = True
+)
+
 cc_binary(
     name = "libtrtorch.so",
     srcs = [],