feat: add missing api endpoints

[dated]

Adds the rounds API endpoints.

Adds the transaction/fees endpoint.

Adds the node/fees endpoint.

What kind of change does this PR introduce?

• Bugfix
• Feature
• Refactor
• Performance
• Tests
• Build
• Documentation
• Code style update
• Continuous Integration
• Other, please describe:

Does this PR introduce a breaking change?

• Yes
• No

Does this PR release a new version?

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• It's submitted to the develop branch, not the master branch
• All tests are passing
• New/updated tests are included

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

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[sleepdefic1t]

Thank you, @dated

Are there currently any more Endpoints that need added?
That way we can just roll it all into one PR instead of adding them individually.

[dated]

I believe there's one more, node/fees.

[faustbrian]

Any more endpoints missing that should be added? So we can wrap them up in a single PR.

[dated]

The node/fees endpoint is missing.

[faustbrian]

Will have a look once the node/fees endpoint is added.

[dated]

@sleepdefic1t are you ok with the node/fees endpoint?

[sleepdefic1t]

Looks good and all tests pass on macOS for me.
Thank you, @dated

@faustbrian
This is good to go 👍

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Thank you for your contribution!

[dated]

👀

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