Fix WASM MVP (#168)

## 🎟️ Tracking

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## 📔 Objective
 
After we compile the MVP WASM build for wasm2js, we need to run
wasm-bindgen to do it's thing, otherwise the build completes but it's
not useable in webpack.

As wasm-bindgen generates a whole folder with duplicate support scripts,
I've pointed it to a temp folder that is then deleted at the end.

## ⏰ Reminders before review

- Contributor guidelines followed
- All formatters and local linters executed and passed
- Written new unit and / or integration tests where applicable
- Protected functional changes with optionality (feature flags)
- Used internationalization (i18n) for all UI strings
- CI builds passed
- Communicated to DevOps any deployment requirements
- Updated any necessary documentation (Confluence, contributing docs) or
informed the documentation
  team

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Author: dani-garcia

crates/bitwarden-wasm-internal/build.sh

@@ -29,19 +29,19 @@ wasm-bindgen --target nodejs --out-dir crates/bitwarden-wasm-internal/npm/node .
 # this normally requires a nightly build, but we can also use the 
 # RUSTC_BOOTSTRAP hack to use the same stable version as the normal build
 RUSTFLAGS=-Ctarget-cpu=mvp RUSTC_BOOTSTRAP=1 cargo build -p bitwarden-wasm-internal -Zbuild-std=panic_abort,std --target wasm32-unknown-unknown ${RELEASE_FLAG}
-cp ./target/wasm32-unknown-unknown/${BUILD_FOLDER}/bitwarden_wasm_internal.wasm ./crates/bitwarden-wasm-internal/npm/bitwarden_wasm_internal_bg.mvp.wasm
+wasm-bindgen --target bundler --out-dir crates/bitwarden-wasm-internal/npm/mvp ./target/wasm32-unknown-unknown/${BUILD_FOLDER}/bitwarden_wasm_internal.wasm
 
 # Format
 npx prettier --write ./crates/bitwarden-wasm-internal/npm
 
 # Optimize size
 wasm-opt -Os ./crates/bitwarden-wasm-internal/npm/bitwarden_wasm_internal_bg.wasm -o ./crates/bitwarden-wasm-internal/npm/bitwarden_wasm_internal_bg.wasm
 wasm-opt -Os ./crates/bitwarden-wasm-internal/npm/node/bitwarden_wasm_internal_bg.wasm -o ./crates/bitwarden-wasm-internal/npm/node/bitwarden_wasm_internal_bg.wasm
-wasm-opt -Os ./crates/bitwarden-wasm-internal/npm/bitwarden_wasm_internal_bg.mvp.wasm -o ./crates/bitwarden-wasm-internal/npm/bitwarden_wasm_internal_bg.mvp.wasm
+wasm-opt -Os crates/bitwarden-wasm-internal/npm/mvp/bitwarden_wasm_internal_bg.wasm -o ./crates/bitwarden-wasm-internal/npm/bitwarden_wasm_internal_bg.mvp.wasm
 
 # Transpile to JS
 wasm2js ./crates/bitwarden-wasm-internal/npm/bitwarden_wasm_internal_bg.mvp.wasm -o ./crates/bitwarden-wasm-internal/npm/bitwarden_wasm_internal_bg.wasm.js
 npx terser ./crates/bitwarden-wasm-internal/npm/bitwarden_wasm_internal_bg.wasm.js -o ./crates/bitwarden-wasm-internal/npm/bitwarden_wasm_internal_bg.wasm.js
 
 # Remove unneeded files
-rm ./crates/bitwarden-wasm-internal/npm/bitwarden_wasm_internal_bg.mvp.wasm
+rm -rf ./crates/bitwarden-wasm-internal/npm/mvp