Add script to generate standard property tests

tools/property-test-generator/README.md

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+# Property Test Generator
+
+This tool generates standard property tests for built-in functions and objects.
+
+Supported options:
+
+- `--dry-run`: Don't write any output files.
+- `--include`: Comma separated list of globs to filter which built-ins are included.
+- `--exclude`: Comma separated list of globs to filter which built-ins are excluded.
+- `--features`: Comma separated list of features from "features.txt". If not specified features are guessed based on files in the same directory.
+- `--globals`: Spec files or directories defining additional global properties. Needed when generating tests for ECMA-402 or for proposals.
+
+Run with `--help` to show all available command line arguments:
+
+```sh
+$ python tools/property-test-generator/main.py --help
+```
+
+Examples:
+
+- Generate property tests for all built-ins defined in "$ECMA262/spec.html":
+```sh
+$ python tools/property-test-generator/main.py $ECMA262/spec.html
+```
+
+- Generate property tests for the `Number` constructor, but not the `Number` prototype object:
+```sh
+$ python tools/property-test-generator/main.py --include=Number* --exclude=Number.prototype* $ECMA262/spec.html
+```
+
+- Generate property tests for all built-ins defined in "$ECMA402/spec":
+```sh
+python tools/property-test-generator/main.py --global=$ECMA262/spec.html $ECMA402/spec/
+```
+
+The `--global` argument is necessary to correctly pick up global definitions from ECMA-262.
+
+- Generate property tests for all built-ins defined in the `Temporal` proposal:
+```sh
+python tools/property-test-generator/main.py --globals=$ECMA262/spec.html --globals=$ECMA402/spec/ --features=Temporal $PROPOSALS/proposal-temporal/spec/
+```
+
+The `--features` argument adds `features: [Temporal]` to test metadata section.