feat(codegen): router rework

[Gosunov]

Closes #2434

Currently doesn't work because of bug in Asm.fif I guess...
Improves all gas benchmarks except wallet externals
This is passing all the tests if you replace function writeOpcodeChecker in writeRouter.ts, to this, but this ruins the perfomance :(

function writeOpcodeChecker(opcode: bigint, wCtx: WriterContext) {
    const opHex = opcode.toString(16).padStart(8, "0");
    wCtx.append(
        `(slice, int) ${opcodeCheckerFuncId(opcode)}(slice s) asm "<{ x{${opHex}} SDBEGINSQ }>c CALLREF";`
    );
}