feat(cli-tools): Add --partition flag to stream publish

[teogeb]

Added an optional flag to stream publish to control the target partition.

Default partition

Note that the default value for the partition is undefined, i.e. it publishes to random partition (just like before this PR). In stream-subscribe there is similar flag, which has a default value of 0 (i.e. it subscribes to the first partition).

Test

Improved test coverage by adding tests for partition-related functionality of stream-publish command. Also renamed existing stream-publish-subscribe.test.ts to stream-subscribe.test.ts as those test cases are asserting the subscribe outputs.

---

Note

Adds --partition to stream publish with validation against --partition-key-field, updates tests, and notes change in changelog.

• CLI (packages/cli-tools)
  • stream publish: Add --partition option and parse via createFnParseInt; pass { streamId, partition } to client.publish.
  • Validate mutually exclusive use of --partition and --partition-key-field (exit with error on conflict).
• Tests
  • New stream-publish.test.ts: covers default publish, explicit --partition, and --partition-key-field routing.
  • Refactor stream-subscribe.test.ts: publish via SDK helper instead of CLI; minor renames and typings.
  • Test utils: add nextValue() helper.
• Docs
  • CHANGELOG.md: document new --partition flag under @streamr/cli-tools.

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