* Refactor Wave client to use lib-httpx library

- Replace manual HTTP retry logic with HxClient from io.seqera:lib-httpx:1.2.0
- Update RetryOpts to implement Retryable.Config interface from lib-retry
- Add multiplier field to RetryOpts for exponential backoff configuration
- Remove manual JWT token refresh logic in favor of HxClient built-in handling
- Update WaveClient to use HxClient.sendAsString() instead of raw HttpClient
- Remove redundant retry policy and HTTP response handling code
- Update tests to reflect API changes and remove obsolete HTTP retry test

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Bump httpx@1.3.0

Signed-off-by: Paolo Di Tommaso <paolo.ditommaso@gmail.com>

* Improve integration

Signed-off-by: Paolo Di Tommaso <paolo.ditommaso@gmail.com>

* Refactor Tower client to use lib-httpx library (#6357)

* Refactor Tower client to use lib-httpx library

- Replace manual HTTP retry logic with HxClient from io.seqera:lib-httpx
- Update TowerClient.sendHttpMessage() to use HxClient.sendAsString()
- Add HxClient configuration with retry settings, JWT token, and refresh token handling
- Update makeRequest() helper method to properly build HttpRequest objects with body content
- Remove redundant HTTP response handling code in favor of HxClient built-in functionality
- Update SimpleHttpClient to support content-type and authorization headers
- Update tests to reflect API changes
- Add comprehensive annotations to TowerRetryPolicy with default values
- Add Javadoc documentation to TowerRetryPolicy class explaining retry behavior
- Fix missing annotations in WaveConfig BuildOpts class (conda, compression, maxDuration)



Signed-off-by: Paolo Di Tommaso <paolo.ditommaso@gmail.com>
Signed-off-by: Ben Sherman <bentshermann@gmail.com>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Ben Sherman <bentshermann@gmail.com>