feat: add opt-in stable member ordering

[oriori1703]

Add the opt-in --stable-member-order flag (and a gui option) to order tied declarations by their renamed signatures; default output remains unchanged.

This is useful when trying to diff different app version, because when source-line information is missing or tied or disabled, renamed declarations can retain different raw input orders across builds, producing noisy diffs.

For example, with debug information disabled and types A and B renamed to Zebra and Alpha:

Default output

class Example {
    Example(Zebra value) {}
    Example(Alpha value) {}

    void zeta() {}
    void alpha() {}
}

With --stable-member-order

class Example {
    Example(Alpha value) {}
    Example(Zebra value) {}

    void alpha() {}
    void zeta() {}
}