webassembly/variants/pyscript: Add pyscript variant.

This commit adds a pyscript variant for use in https://pyscript.net/.

The configuration is:
- No ASYNCIFY, in order to keep the WASM size down and have good
  performance.
- MICROPY_CONFIG_ROM_LEVEL_FULL_FEATURES to enable most features.
- Custom manifest that includes many of the python-stdlib libraries.
- MICROPY_GC_SPLIT_HEAP_AUTO to increase GC heap size instead of doing a
  collection when memory is exhausted.  This is needed because ASYNCIFY is
  disabled.  Instead the GC collection is run at the top-level before
  executing any Python code.
- No MICROPY_VARIANT_ENABLE_JS_HOOK because there is no asynchronous
  keyboard input to interrupt a running script.

Signed-off-by: Damien George <damien@micropython.org>

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