feat(structured options): refactor methods to accept structured options

[clok]

Refactored exported methods to use structured options as inputs. This will allow for further extension of features without further modifying the interface.

Examples:

type EncryptOptions struct {
	Body     *[]byte
	Password *[]byte
	VaultID  string
}

type DecryptOptions struct {
	Data     *[]byte
	Password *[]byte
}

I opted to use *[]byte as the data types for sensitive in order to avoid storing data in plaintext via string types as well as avoiding extra copies of the values in memory when passing the data.

I will update the internal methods to accept pointers instead of strings as well.

NOTE: This will coincide with a major version bump to v3.0.0