elk-#3 document public api

[elfenpiff]

Notes for Reviewer

• Documents the full public API of elkodon
• renamed global_config.rs into config.rs
• make static_config and dynamic_config available through the pub-subs and events port factory.

Pre-Review Checklist for the PR Author

1. [x] Add sensible notes for the reviewer
2. [x] PR title is short, expressive and meaningful
3. [x] Relevant issues are linked
4. [x] Every source code file has the SPDX header SPDX-License-Identifier: $(LICENSE_CODE)
5. [x] Branch follows the naming format (elk-123-introduce-posix-ipc-example)
6. [x] Commits messages are according to this guideline
   • [x] Commit messages have the issue ID ([#123] Add posix ipc example)
   • [x] Commit author matches Eclipse Contributor Agreement (and ECA is signed)
7. [x] Tests follow the best practice for testing
8. [x] Changelog updated in the unreleased section including API breaking changes
9. [x] Assign PR to reviewer
10. [x] All checks have passed (except task-list-completed)

Checklist for the PR Reviewer

• [x] Commits are properly organized and messages are according to the guideline
• [x] Unit tests have been written for new behavior
• [x] Public API is documented
• [x] PR title describes the changes

Post-review Checklist for the PR Author

1. [x] All open points are addressed and tracked via issues

References

Use either 'Closes #123' or 'Relates to #123' to reference the corresponding issue.

Relates to #3

[codecov[bot]]

Codecov Report

Attention: 45 lines in your changes are missing coverage. Please review.

Comparison is base (dd6bea0) 77.42% compared to head (bf8b0e9) 77.35%.

Files	Patch %	Lines
elkodon/src/config.rs	65.97%	33 Missing :warning:
...don/src/service/static_config/publish_subscribe.rs	88.46%	3 Missing :warning:
elkodon/src/service/port_factory/event.rs	75.00%	2 Missing :warning:
...odon/src/service/port_factory/publish_subscribe.rs	77.77%	2 Missing :warning:
elkodon/src/port/mod.rs	0.00%	1 Missing :warning:
elkodon/src/service/builder/event.rs	75.00%	1 Missing :warning:
elkodon/src/service/messaging_pattern.rs	94.73%	1 Missing :warning:
elkodon/src/service/process_local.rs	66.66%	1 Missing :warning:
elkodon/src/service/zero_copy.rs	66.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #52 +/- ## ========================================== - Coverage 77.42% 77.35% -0.08% ========================================== Files 166 167 +1 Lines 18878 18797 -81 ========================================== - Hits 14617 14540 -77 + Misses 4261 4257 -4 ```

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