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Add Weld for Java dependency injection

Weld is the reference implementation of "CDI: Contexts and Dependency
Injection for the Java EE Platform."

- https://weld.cdi-spec.org/
- https://www.cdi-spec.org/

This is in preparation for introducing the StringCalculator interface,
which I'll use to inject different StringCalculator implementations into
the Servlet.

This involved:

- Adding implementation dependencies for:
  - org.jboss.weld.servlet:weld-servlet-core
  - io.smallrye:jandex (recommended for speeding up bean discovery)

- Adding new strcalc/src/main/webapp files to add to the servlet WAR
  file, not needed until now, configured according to
  https://docs.jboss.org/weld/reference/5.1.2.Final/en-US/html_single/#tomcat:
  - META-INF/context.xml
  - WEB-INF/web.xml

- Added strcalc/src/main/webapp/WEB-INF/beans.xml because Weld will skip
  initialization without it, with the warning:
  WELD-ENV-000028: Weld initialization skipped - no bean archive found

- Updating the TestTomcat helper to find these new files and to enable
  Java Naming and Directory Interface (JNDI), required by Weld:
  - https://docs.oracle.com/javase/tutorial/jndi/overview/index.html
  - https://docs.jboss.org/weld/reference/5.1.2.Final/en-US/html_single/#_binding_the_manager_in_jndi
  - https://tomcat.apache.org/tomcat-10.1-doc/api/org/apache/catalina/startup/Tomcat.html#enableNaming()

One silver lining was that adding JarScanner > JarScanFilter element to
META-INF/context.xml rendered the custom TestTomcat logic to disable the
JarScanner unnecessary.

Perhaps the other silver lining is that the TestTomcat now tracks
whatever's in src/main/webapp. This should enable the TestTomcat
configuration to remain in sync with the final WAR file.

---

And now for what I really came here to say: I hate Java. I _really_,
_really_, _really_ hate Java. Not so much the language itself, but the
entire culture and ecosystem that has festered around it for 28 years.

If the question is:

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