chore: prepare GAX for monorepo (googleapis/gax-php#663)

Author: bshaffer

Gax/.gitattributes

@@ -1,8 +1,5 @@
 .gitattributes export-ignore
 .gitignore export-ignore
 .github export-ignore
-dev export-ignore
 tests export-ignore
-codecov.yml export-ignore
-ruleset.xml export-ignore
-.travis.yml export-ignore
+/*.dist export-ignore

Gax/README.md

@@ -73,21 +73,13 @@ be found for Mac or Windows.
 3.  Run tests.
 
     ```sh
-    > composer test
+    > vendor/bin/phpunit
     ```
 
-4.  Updating dependencies after changing `composer.json`:
+4.  Run static analysis tools
 
     ```sh
-    > composer update
-    `
-    ```
-
-5.  Formatting source:
-
-    ```sh
-    > composer cs-lint
-    > composer cs-fix
+    > phpstan -c phpstan.neon.dist
     ```
 
 ## License

Gax/codecov.yml

@@ -34,17 +34,10 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "Google\\ApiCore\\Dev\\": "dev/src",
             "Google\\ApiCore\\Tests\\": "tests",
-            "GPBMetadata\\Google\\": "metadata/Google",
+            "Google\\ApiCore\\Testing\\": "tests/Unit/testdata/generated",
             "Google\\Showcase\\": "tests/Conformance/src",
             "GPBMetadata\\Google\\Showcase\\": "tests/Conformance/metadata"
         }
-    },
-    "scripts": {
-        "regenerate-test-protos": "dev/sh/regenerate-test-protos.sh",
-        "test": "./vendor/bin/phpunit",
-        "cs-lint": "vendor/bin/php-tools cs-fixer googleapis/gax-php --ref $(git rev-parse --abbrev-ref HEAD) --flags \"\\-n --dry-run\"",
-        "cs-fix": "vendor/bin/php-tools cs-fixer googleapis/gax-php --ref $(git rev-parse --abbrev-ref HEAD) --flags \"\\-n\""
     }
 }

Gax/composer.json

@@ -1,8 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" bootstrap="tests/bootstrap.php" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd" colors="true">
-  <php>
-    <env name="GOOGLE_APPLICATION_CREDENTIALS" value="tests/Unit/testdata/json-key-file.json"/>
-  </php>
   <coverage>
     <include>
       <directory suffix=".php">src/ApiCore</directory>