feat: Improve formatting in print streaming chunk

[sjrl]

Related Issues

• fixes #issue-number

Proposed Changes:

• Updates StreamingChunk construction in ToolInvoker to also stream a chunk with a finish reason. This is useful when using the print_streaming_chunk utility method
• Update the print_streaming_chunk to have better formatting of messages especially when using it with Agent.
  • Also updated to work with the current version of the AWS Bedrock integration by working with the dict representation of ChoiceDeltaToolCall
• Further improvements will come in feat: Update streaming chunk #9424 but wanted to get this into the 2.14.0 release

Here is an example of a before and after:

• Biggest improvement is the spacing between headers e.g. [TOOL CALL]
• The too many newlines will be addressed in the previously mentioned other PR

Here is a before

and an after

How did you test it?

Tested locally

Notes for the reviewer

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test: and added ! in case the PR includes breaking changes.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[coveralls]

Pull Request Test Coverage Report for Build 15210001148

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 74 unchanged lines in 7 files lost coverage.
• Overall coverage decreased (-0.1%) to 90.087%

---

Files with Coverage Reduction	New Missed Lines	%
components/agents/init.py	1	75.0%
utils/init.py	2	33.33%
components/agents/agent.py	10	91.07%
components/generators/utils.py	10	20.0%
dataclasses/state_utils.py	11	0.0%
utils/base_serialization.py	16	86.99%
components/tools/tool_invoker.py	24	83.92%

Totals
Change from base Build 15205760859:	-0.1%
Covered Lines:	11341
Relevant Lines:	12589

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💛 - Coveralls

[vblagoje]

Left some optional stylistic suggestions