[WIP] use Error type intead of Result

[bobzhang]

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[bobzhang]

TODO: maybe we should just call it Bool::from_string instead of parse_bool?

[qazxcdswe123]

Known issues:

1. strconv/traits.mbt test: Fatal error: exception Ctype.Unify
2. json/json_test.mbt test stringify

Error: Failed to compile wasm module
Error when running~/.moon/lib/core/target/wasm-gc/debug/test/json/json.underscore_test.wasm: Failed to run the test

wasm-validate ~/.moon/lib/core/target/wasm-gc/debug/test/json/json.underscore_test.wasm
000000e: error: unexpected type form (got 0x50)

[bobzhang]

cc @Yu-zh the Unify error is still there

[bobzhang]

@bzy-debug do we have OCAMLRUNPARAM="b=1" setup properly so that backtrace is available (for bleeding version)