Don't stop XRPL txs scanning if one tx in the result contains unexpected json structure.

[dzmitryhil]

Description

• Don't stop XRPL txs scanning if one tx in the result contains unexpected json structure.
• Add xrpl_rpc_decoding_errors_total metric and alert.

Reviewers checklist:

• Try to write more meaningful comments with clear actions to be taken.
• Nit-picking should be unblocking. Focus on core issues.

Authors checklist

• Provide a concise and meaningful description
• Review the code yourself first, before making the PR.
• Annotate your PR in places that require explanation.
• Think and try to split the PR to smaller PR if it is big.

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This change is 

[ysv]

Reviewed 11 of 11 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @dzmitryhil, @masihyeganeh, @miladz68, and @wojtek-coreum)

a discussion (no related file):
nit: all good just commit name is not clear for me
Do you mean smth like: Make XRPL RPC client decoding new response stucts tolerant

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[miladz68]

Reviewed 11 of 11 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @dzmitryhil, @masihyeganeh, and @wojtek-coreum)