Reject leading/trailing whitespaces for token id

[alpe]

Follow up on https://github.com/CosmWasm/wasmd/issues/1206#issuecomment-1450149264

[taitruong]

Agree on this - respectively I don't see why token ids should have whitespaces.

valid token ids:

• alphaNumeric111
• 001
• spaces between words
• _underscore_

invalid token ids:

• leading spaces
• trailing spaces