fix: Handle serialization and deserialization of bigint as ByteString

[satran004]

Issue:

PlutusData.deserialize() doesn't handle BigInteger properly when it is encoded as a ByteString. Instead, it decodes BigInteger as BytesPlutusData.

BigInteger can also be represented as bytes.

big_int = int / big_uint / big_nint
big_uint = #6.2(bounded_bytes)
big_nint = #6.3(bounded_bytes)

Fix

• Read Tag of the ByteString to identify if it's a positive and negative number

Example (Datum):

d8798b581c217a7bf7a6494a0165ae2cb77aabeadb865d33d5be5f9f57b9b0e8f6581c276ba8bb7fe700d0d21b7da11edeb650729efe0b1595af0e643e31844b4e656f6e50756e6b3033311a3b9aca005563687447785a454339663038514d504b6970773073d87980d87980c2410040c241005820dee0b6f2b41b1a75244ec7b83c77c45d5cda5ad4ff3a4964340bb6089d5256e5