Integrate Assembler from polkavm's spectool

[tomusdrw]

This PR adds another option to load a new program to execute/debug in PVM - typing the assembly code from polkavm's spectool.

The a special version of spectool (see https://github.com/tomusdrw/polkavm/tree/master/tools/spectool-wasm) has been compiled to WASM and published to NPM registry as @typeberry/spectool-wasm. This code is later loaded here, so one can write in the same format as for spectool JSON files to get the bytecode directly in the browser.

I've also integrated a disassembler, so after loading a PVM program from any input (i.e. JSON upload, example) you can click "Load" again and then go to Assembly to alter the program. Hopefully the resulting bytecode should be the same :)

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