Add USM instrumentation

[Yumasi]

What Does This Do

This PR adds a new instrumentation, sslsocket, that captures HTTPS traffic in Java applications that use SSLSocket under the hood, and sends it to system-probe via a custom ioctl. This part of USM's HTTPS monitoring support.

Few things to note:

• This is meant to be attached to Java process by system-probe (which uses jattach under the hood), which requires a different way to get the javaagent args, hence the addition to agentmain.
• The instrumentation does not produce traces, but instead does an ioctl using jna. The dependency to jna is the reason UsmMessage and UsmExtractor implementations are in separate packages.
• Due to it only making an ioctl call as a side-effect, the included instrumentation test focuses on the "instrumentation part" i.e the advices, to make sure it does the expected calls to the implementation that makes the actual ioctl call.

Changes for second review round

• The instrumentation now targets SSLSocket instead of SSLSocketImpl.

Motivation

Additional Notes

[mcculls]

Needs a bit more cleanup before this can be merged - see comments about using USM specific package for new types and preferring agent-bootstrap over internal-api for bootstrap related instrumentation types

[mcculls]

Once the unrelated formatting changes have been cleaned up this should be OK to merge

Valeri is on PTO but we need this merged this week

[nikita-tkachenko-datadog]

This breaks logic introduced in #4888

Specifically the part in AgentBootstrap:

parseAsSystemProperties(agentArgs);

parses agent arguments and injects them as system properties.

The same logic was implemented in AgentArgsInjector in the PR linked above (the only difference being that , is used to separate arguments rather than ).

As the code added here expects args to be separated with space, when args are supplied in previous comma-separated format, they are all lumped together and injected under the name of the first arg.

My suggestion would be to revert the parseAsSystemProperties part of the changes done here in favour of the AgentArgsInjector logic, as that has already been released to the public.