[move-diassembler][small] Display strings in disassembler

[tzakian]

Description

Tries to determine if a constant in the constant pool can be interpreted as a utf8 string. If it can it displays it as such, and adds a comment saying it's interpreted the data that way.

Test Plan

Tested locally:

module 0x1::M {
    const X: vector<u8> = b"hello world";
    public fun use_X(): vector<u8> { X }
}

$ move disassemble --name M
// Move bytecode v6
module 1.M {


public use_X(): vector<u8> {
B0:
        0: LdConst[0](Vector(U8): 0b68656c..)
        1: Ret
}

Constants [
        0 => vector<u8>: "hello world" // interpreted as UTF8 string
]
}

---

If your changes are not user-facing and not a breaking change, you can skip the following section. Otherwise, please indicate what changed, and then add to the Release Notes section as highlighted during the release process.

Type of Change (Check all that apply)

• protocol change
• user-visible impact
• breaking change for a client SDKs
• breaking change for FNs (FN binary must upgrade)
• breaking change for validators or node operators (must upgrade binaries)
• breaking change for on-chain data layout
• necessitate either a data wipe or data migration

Release notes

Updated display of constants in disassembled Move bytecode to try and show the deserialized string if the constant is a vector<u8> that is valid utf8.

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[sblackshear]

Thanks Tim!