Add XRPL token registration

[dzmitryhil]

• Add XRPL token registration with integration tests
• Update coreum token registration with the sending of the XRPL token with the created currency

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This change is 

[miladz68]

Reviewed 6 of 6 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @keyleu, @wojtek-coreum, and @ysv)

[miladz68]

Reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @keyleu, @wojtek-coreum, and @ysv)

[keyleu]

Reviewed 2 of 6 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @wojtek-coreum and @ysv)

[miladz68]

Reviewed 2 of 2 files at r3, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @wojtek-coreum and @ysv)

[keyleu]

Reviewed 3 of 6 files at r1, 1 of 1 files at r2, 2 of 2 files at r3, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @wojtek-coreum and @ysv)