Add model package, visitors, and validation rules (#1)

Author: pkedy

.github/workflows/build.yaml

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+name: Build
+
+on:
+  push:
+    branches:
+      - main
+      - release-*
+    tags:
+      - v*
+  pull_request:
+    branches:
+      - main
+      - release-*
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1      
+
+      - uses: actions/setup-go@v3
+        with:
+          go-version: '1.19'
+  
+      - uses: acifani/setup-tinygo@v1
+        with:
+          tinygo-version: 0.25.0
+
+      - uses: actions/setup-go@v3
+        with:
+          go-version: '1.19'
+      
+      - name: Install wasm-opt
+        run: |
+          wget https://github.com/WebAssembly/binaryen/releases/download/version_110/binaryen-version_110-x86_64-linux.tar.gz
+          tar -xvzf binaryen-version_110-x86_64-linux.tar.gz
+          rm -rf binaryen-version_110-x86_64-linux.tar.gz
+          cp binaryen-version_110/bin/wasm-opt /usr/local/bin
+          rm -Rf binaryen-version_110
+      
+      - name: Install tinyjson
+        run: go install github.com/CosmWasm/tinyjson/...@latest
+
+      - name: Install Apex CLI
+        run: wget -q https://apexlang.io/install.sh -O - | /bin/bash
+
+      - name: Apex code generation
+        run: apex generate
+      
+      - name: Build WebAssembly parser
+        run: |
+          tinygo build -o apex-parser.wasm -scheduler=none -target=wasi -wasm-abi=generic -no-debug cmd/apex-api/main.go
+          wasm-opt -O apex-parser.wasm -o apex-parser.wasm
+
+      - name: Is Release?
+        if: startswith(github.ref, 'refs/tags/v')
+        run: echo "DEPLOY_PACKAGE=true" >> $GITHUB_ENV
+
+      - name: Upload WebAssebly parser
+        if: env.DEPLOY_PACKAGE == 'true'
+        uses: actions/upload-artifact@v2
+        with: 
+          name: Apex Parser Wasm Module
+          path: apex-parser.wasm

.gitignore

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+*.wasm
+test.*
+/apex-host

Makefile

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+.PHONY: all wasm-cli wasm-api codegen
+
+all: codegen wasm-cli wasm-api wasm-host
+
+wasm-cli:
+	tinygo build -o apex-cli.wasm -scheduler=none -target=wasi -wasm-abi=generic -no-debug cmd/apex-cli/main.go
+	wasm-opt -O apex-cli.wasm -o apex-cli.wasm
+
+wasm-api:
+	tinygo build -o apex-api.wasm -scheduler=none -target=wasi -wasm-abi=generic -no-debug cmd/apex-api/main.go
+	wasm-opt -O apex-api.wasm -o apex-api.wasm
+	cp apex-api.wasm cmd/host/apex-api.wasm
+
+wasm-host:
+	go build -o apex-host cmd/host/main.go
+
+codegen:
+	apex generate

apex.yaml

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+spec: model.apexlang
+config:
+  package: model
+  module: github.com/apexlang/apex-wasm
+generates:
+  model/model.go:
+    module: '@apexlang/codegen/go'
+    visitorClass: InterfacesVisitor
+    config:
+      writeTypeInfo: false
+    runAfter:
+      - command: tinyjson -all model/model.go