Block Explorer API: transaction by hash should not be case sensitive

[edd]

Problem encountered

The following transaction hashes are equivalent, and yet Block Explorer API will only find one:

https://be.testnet.vega.xyz/rest/transactions/C2EB359C17E5DFC67A39D0868BB6D5CE62FBD1AED3985F7D8867485F79B63EC6

https://be.testnet.vega.xyz/rest/transactions/c2eb359c17e5dfc67a39d0868bb6d5ce62fbd1aed3985f7d8867485f79b63ec6

Observed behaviour

BE api matches case sensitively

Expected behaviour

Hashes are not case sensitive, and thus should match regardless of case

Acceptance criteria

The following hashes should all be equivalent and return the same transaction:
c2eb359c17e5dfc67a39d0868bb6d5ce62fbd1aed3985f7d8867485f79b63ec6
C2EB359C17E5DFC67A39D0868BB6D5CE62FBD1AED3985F7D8867485F79B63EC6
C2EB359C17E5DFC67A39D0868BB6D5Ce62FBD1AED3985F7D8867485F79B63EC6