fix: Make ToAddress in routeAction nullable

[AntonAndell]

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• [x] I have performed a self-review of my own code
• [ ] I have documented my code in accordance with the documentation guidelines
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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 74.27%. Comparing base (50031b0) to head (e9aefb3).

Files	Patch %	Lines
...etwork/balanced/score/lib/structs/RouteAction.java	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #427 +/- ## ========================================= Coverage 74.27% 74.27% Complexity 1910 1910 ========================================= Files 128 128 Lines 9121 9121 Branches 1105 1105 ========================================= Hits 6775 6775 Misses 1863 1863 Partials 483 483 ``` | [Flag](https://app.codecov.io/gh/balancednetwork/balanced-java-contracts/pull/427/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=balancednetwork) | Coverage Δ | | |---|---|---| | [java](https://app.codecov.io/gh/balancednetwork/balanced-java-contracts/pull/427/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=balancednetwork) | `74.27% <0.00%> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=balancednetwork#carryforward-flags-in-the-pull-request-comment) to find out more.

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