Add a wrapper script for the test runner that runs custom section tests

Author: yuri91

test/custom/README.md

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+This directory contains tests for well-known WebAssembly custom sections and annotations.
+
+Tests are written in the [S-Expression script format](https://github.com/WebAssembly/spec/blob/main/interpreter/README.md#s-expression-syntax) defined by the interpreter.
+
+The test suite can be run with the spec interpreter as follows:
+```
+./run.py --wasm <path-to-wasm-interpreter>
+```
+where the path points to the spec interpreter executable (or a tool that understands similar options). If the binary is in the working directory, this option can be omitted.
+
+In addition, the option `--js <path-to-js-interpreter>` can be given to point to a stand-alone JavaScript interpreter supporting the WebAssembly API. If provided, all tests are also executed in JavaScript.

test/custom/run.sh

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+#!/usr/bin/env bash
+
+SCRIPT_DIR=$(dirname "$(readlink -f "$0")")
+
+TESTS=$(ls ${SCRIPT_DIR}/*/*.wast)
+exec "${SCRIPT_DIR}/../core/run.py" --opts '-ca ' $@ -- ${TESTS}