BM-251: Expand .vscode/settings.json and add .watchmanconfig (github#73)

Updates the VSCode `settings.json` to match the
`.vim/coc-settings.json`. In particular, this adds
`RISC0_SKIP_BUILD_KERNEL` to the check config. It also adds a
`.watchmanconfig` file. See risc0/risc0#2428 for
more context.

Author: nategraf

.vscode/settings.json

@@ -1,5 +1,8 @@
 {
-    "rust-analyzer.check.extraEnv": {
-        "RISC0_SKIP_BUILD": "1",
-    }
-}
+  "rust-analyzer.check.allTargets": true,
+  "rust-analyzer.check.features": [],
+  "rust-analyzer.check.extraEnv": {
+    "RISC0_SKIP_BUILD": "1",
+    "RISC0_SKIP_BUILD_KERNELS": "1"
+  }
+}

.watchmanconfig

@@ -0,0 +1,11 @@
+{
+  "ignore_dirs": [
+    "target",
+    "crates/guest/resolve/resolve-guest/target",
+    "crates/guest/util/echo/target",
+    "crates/guest/util/identity/target",
+    "crates/guest/assessor/assessor-guest/target",
+    "crates/guest/set-builder/set-builder-guest/target",
+    "examples/counter/target"
+  ]
+}