Point Initialization Modernization and resulting code changes

[masonwillman]

This PR updates the methods used for fetchStationData from GDAL's OGR functions to CPLJSON functions.

• fetchStationData has been reimplemented with clearer variable names, comments, and methods
• Removed unneeded functions after CPLJSON implementation.

@latwood take a look at the changes and see if there is anything else that needs fixed. Additional items needed added to the PR before merging

• Update vcpkg so Windows and Linux use the same dependency versions (this re-implementation was caused by a bug with newer GDAL versions)
• Add a API key secret related to point initialization fetching.

[latwood]

@masonwillman tested again, works on my Windows and Ubuntu builds.

For the record, this also fixes the issue I was experiencing on Windows, where OGR_F_GetFieldAsDoubleList() calls were failing because the data were seen as string instead of as type realList. OGR_F_GetFieldAsString() worked but required a bunch of extra parsing because OGR_F_GetFieldAsStringList() wouldn't work. The CPLJSON functions turned out to be a more direct fix.