Implement format = sf for osm_get_gpx_metadata()

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.07%. Comparing base (2b9bd24) to head (52a4979).

Files	Patch %	Lines
R/osm_get_gpx_metadata.R	88.88%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #38 +/- ## ========================================== - Coverage 94.10% 94.07% -0.04% ========================================== Files 28 28 Lines 2307 2312 +5 ========================================== + Hits 2171 2175 +4 - Misses 136 137 +1 ```

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