Add support for InvokeHostFunctionOperation & add Address class.

[overcat]

Changelog:

• Add support for InvokeHostFunctionOperation. (Closes Support for new InvokeHostFunctionOperation #472)
• Add support for parsing InvokeHostFunctionOperationResponse.
• Add Address class, it represents a single address in the Stellar network.
• Updated xdr definitions for Stellar Soroban & fix the issues caused by the XDR update.

Note:

This PR depends on stellar/xdrgen#159, stellar/xdrgen#160 and stellar/xdrgen#161, let's also merge these PRs.

[sreuland]

@overcat , we have an epic, #470 which captures a breakdown of sub-tasks related to soroban support also, it might help to refer to that to help scope these PR's down to one of those tasks at a time. This PR looks pretty aligned with #472 , do you agree?

[overcat]

Hi @sreuland, could you please create a soroban branch from the master branch? This way, I can set the merge target to the soroban branch and make each PR as small as possible.

P.S. Let's merge this PR first and then continue with other tasks.

[sreuland]

@overcat , created soroban branch, thanks!

[overcat]

@overcat , created soroban branch, thanks!

Thank you, I have changed the branch so this PR is ready to be reviewed.

[overcat]

Hi, @sreuland and @tamirms, the PR is ready, could you please review and merge it?

[overcat]

Rebased the code to make the commit log more readable, without including any code changes.

[overcat]

If there are no other issues, let's merge this PR so that other PRs can join the queue.

[sreuland]

@overcat , I left review comments with some changes for consideration, overall looks good, based on your feedback on those, we can get this merged when ready. thanks!

[overcat]

@sreuland PTAL

[sreuland]

nice work!

[overcat]

Rebased the code to make the commit log more readable, without including any code changes.

[overcat]

Hi @sreuland, PTAL, if there are no other issues, please merge it.

[sreuland]

Hi @sreuland, PTAL, if there are no other issues, please merge it.

@overcat , does this pr close out #472 ? if so, can you add Closes #472 to the PR's description before we merge, to get tickets to be auto-completed at same time, thanks!

[overcat]

Hi @sreuland, PTAL, if there are no other issues, please merge it.

@overcat , does this pr close out #472 ? if so, can you add Closes #472 to the PR's description before we merge, to get tickets to be auto-completed at same time, thanks!

Added.