fix: move vscodeignore into subpackages

Fixes microsoft/vscode-internalbacklog#1263

Author: connor4312

.vscodeignore renamed to packages/vscode-js-profile-flame/.vscodeignore

@@ -0,0 +1,10 @@
+.vscode/**
+.vscode-test/**
+out/test/**
+src/**
+.gitignore
+vsc-extension-quickstart.md
+**/tsconfig.json
+**/.eslintrc.json
+**/*.map
+**/*.ts