Add support for informix connection string parsing in jdbc instrumentation

[jaydeluca]

When I was converting the JDBC tests from groovy to java I noticed that there was an old TODO around instrumenting informix connection strings, with the test cases commented out.

I took a stab at closing this gap in the event we still would like to have this coverage. I admittedly don't have any experience with informix databases, but I searched for example connection strings across github and referenced these docs.

I added a default port value of 9098 after finding a few references to that online, although I wasn't able to find concrete documentation to validate it.

Here are the sources i did find, for reference:

• https://community.fabric.microsoft.com/t5/Desktop/Connecting-to-Informix/m-p/53829/highlight/true#:~:text=The%20default%20port%20number%20is,can%20be%20resolved%20by%20dns%3F
• https://docs.safe.com/fme/html/FME-Form-Documentation/FME-ReadersWriters/infx_jdbc_nonspatial/add-infx-connection.htm#:~:text=The%20default%20port%20is%209088.&text=The%20name%20of%20the%20IBM%20Informix%20database.&text=Enter%20the%20username%20and%20password%20to%20access%20the%20service.

I can remove the default port if that's not enough to go on

[laurit]

To me this is strange. Looking at https://www.ibm.com/docs/en/informix-servers/12.10?topic=method-format-database-urls before informix-direct it says

For connections on the database server, use the following format:

Does this mean that informix-direct is used when the server is connecting to somewhere? If that is the case should we bother with it at all? Considering that it is difficult to find info about informix-direct it might be the best option. There doesn't seem to be a host and port for informix-direct, if we are going to parse this then imo we should not fill these at all (could skip MODIFIED_URL_LIKE.doParse and INFORMIX.doParse calls).