Remove Codecov configuration and CI steps for uploading coverage/test
reports.
## Motivation and Context
- Codecov integration relies on third-party credentials
- Codecov has not demonstrated clear value for the project:
- Coverage analysis is already handled by kover, which runs locally and
in CI
- PR reviews still require manual inspection of tests regardless of
codecov reports
- Codecov flaky test detection is unreliable, it marks 3325 out of all
tests as flaky with similar failure rates, making the signal useless
(https://app.codecov.io/gh/modelcontextprotocol/kotlin-sdk/tests)
## Motivation and Context
- removed unnecessary badges from readme
- add context7 json file
## How Has This Been Tested?
<!-- Have you tested this in a real application? Which scenarios were
tested? -->
## Breaking Changes
<!-- Will users need to update their code or configurations? -->
## Types of changes
<!-- What types of changes does your code introduce? Put an `x` in all
the boxes that apply: -->
- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update
## Checklist
<!-- Go over all the following points, and put an `x` in all the boxes
that apply. -->
- [ ] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [ ] My code follows the repository's style guidelines
- [ ] New and existing tests pass locally
- [ ] I have added appropriate error handling
- [ ] I have added or updated documentation as needed
## Additional context
<!-- Add any other context, implementation notes, or design decisions
-->
