Unify protobuf generation options

[overvenus]

The protobuf generation options are currently misaligned with tipb, resulting in an inconsistency between the struct and API definition, which may cause confusion and increase maintenance burdens.

While it may not provide performance improvements, I believe it's still beneficial to unify these options. One noticeable benefit is that we can reduce bloated code by removing unused fields.

XXX_NoUnkeyedLiteral struct{} `json:"-"`
XXX_unrecognized     []byte   `json:"-"`
XXX_sizecache        int32    `json:"-"`

[overvenus]

Closed by #1275