update the gmp precompile as it now accepts a v2 user versioned action

[eshaben]

Description

As of Runtime 2500, a new fee mechanism has been added for the GMP precompile, which is implemented in the V2 VersionedUserAction. This PR updates the GMP precompile page and snippet for creating a V2 payload.

Checklist

• If this requires translations for the moonbeam-docs-cn repo, I have created a ticket for the translations in Jira

After Translation Requirements

• No additional PRs are required after the translations are done

[themacexpert]

LGTM 👍

[jboetticher]

Hi @eshaben , I've updated my example code in my repository, which changes the way that the types are handled (the "right" way, using package defined objects). It includes support for the fee in the payload and it also includes support for encoding with MultiLocation V3, which is important for future proofing the code.

This is all in typescript, so let me know if you need a javascript version.

https://github.com/jboetticher/mrl-example/blob/a7dac88728964401eae13c87ec0c6a2fd6508ab1/src/MoonbeamRoutedLiquidityPayloads.ts

[eshaben]

@themacexpert made some changes here, so although you already approved i would appreciate it if you could take a look at the changes! thanks!

[themacexpert]

LGTM 👍