Update the rule of xudt/dob tags

[Keith-CY]

The original rules are defined at #620

The following updates will be adopted:

1. Remove duplicate tag
2. Exclude single whitespace from invisible characters set
   2.1 word_1 word_2 is valid
   2.2 word_1 word2 is invalid

[poor-defined]

A new tag, named "Utility" could be added here to avoid some abusing of duplicated token name which resulting in "suspected" tag.
After the update on the backend, we can hide "Utility" and still show the "suspected" tag.

[zmcNotafraid]

IS UTXO SWAP LP Token THEN show utility, Not UTXO SWAP LP Token but duplicated SHOW suspicious

[poor-defined]

duplicated

Yes

[zmcNotafraid]

xudt tags : ["unnamed", "invalid", "suspicious", "out-of-length-range", "rgb++", "layer-1-asset", "supply-limited", "utility", "layer-2-asset", "supply-unlimited"]
nft tags: ["invalid", "suspicious", "out-of-length-range", "rgb++", "layer-1-asset", "layer-2-asset"]
PR: nervosnetwork/ckb-explorer#2084

[FrederLu]

Verified.

[Keith-CY]

Rule updated, duplicate name will be considered valid

[Keith-CY]

Rule updated, duplicate name will be considered valid

Updated by nervosnetwork/ckb-explorer#2167