Allow to provide custom HTTP options in REST Client Reactive

[Sgitario]

Allow providing custom HTTP options via CDI and for a programmatically created client.

Fix https://github.com/quarkusio/quarkus/issues/26116

[Sgitario]

cc @computerlove @michalszynkiewicz

[quarkus-bot[bot]]

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:waning_crescent_moon: This workflow status is outdated as a new workflow run has been triggered.

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Failing Jobs - Building 605540376203b46232e1d4eb8b48fd2e5a66d712

Status	Name	Step	Failures	Logs	Raw logs
✖	Initial JDK 11 Build	Build	Failures	Logs	Raw logs

Failures

:gear: Initial JDK 11 Build #

- Failing: extensions/resteasy-reactive/rest-client-reactive/deployment 
! Skipped: docs extensions/keycloak-admin-client-reactive/deployment extensions/oidc-client-reactive-filter/deployment and 18 more

:package: extensions/resteasy-reactive/rest-client-reactive/deployment

✖ Failed to execute goal net.revelc.code.formatter:formatter-maven-plugin:2.19.0:validate (default) on project quarkus-rest-client-reactive-deployment: File '/home/runner/work/quarkus/quarkus/extensions/resteasy-reactive/rest-client-reactive/deployment/src/test/java/io/quarkus/rest/client/reactive/CustomHttpOptionsViaInjectedRestClientTest.java' has not been previously formatted. Please format file (for example by invoking `mvn -f extensions/resteasy-reactive/rest-client-reactive/deployment net.revelc.code.formatter:formatter-maven-plugin:2.19.0:format`) and commit before running validation!

[geoand]

@Sgitario this is now causing multiple PRs to fail on the JAX-RS TCK JAXRSClient0133 (see https://github.com/quarkusio/quarkus/pull/27509 for example). If we don't have a quick fix, we'll have to revert it.