ENH: support wide form GeoDataFrames export

[martinfleis]

Adding a direct support of wide from GeoDataFrames as an export format. May behave strangely in some cases but seems to work well in most common cases when you'd want this.

This branch is built on top of #29 for now, will rebase once that is merged. See the IO notebook for examples.

[codecov[bot]]

Codecov Report

Base: 98.97% // Head: 98.99% // Increases project coverage by +0.01% :tada:

Coverage data is based on head (5c7e1b5) compared to base (93d45a3). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #30 +/- ## ========================================== + Coverage 98.97% 98.99% +0.01% ========================================== Files 3 3 Lines 294 298 +4 ========================================== + Hits 291 295 +4 Misses 3 3 ``` | [Impacted Files](https://codecov.io/gh/martinfleis/xvec/pull/30?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Martin+Fleischmann) | Coverage Δ | | |---|---|---| | [xvec/accessor.py](https://codecov.io/gh/martinfleis/xvec/pull/30?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Martin+Fleischmann#diff-eHZlYy9hY2Nlc3Nvci5weQ==) | `100.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Martin+Fleischmann). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Martin+Fleischmann)

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[martinfleis]

I have fixed the unsticking so we always should end with non-duplicated geometries (and possibly many-level mutliindex columns) but have not updated the tests as I'm hitting https://github.com/geopandas/geopandas/pull/2088.

[martinfleis]

@benbovy maybe this is a last thing prior release?

[codecov[bot]]

Codecov Report

Merging #30 (3f0840d) into main (d2a7dba) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #30      +/-   ##
==========================================
+ Coverage   98.98%   99.00%   +0.01%     
==========================================
  Files           3        3              
  Lines         297      301       +4     
==========================================
+ Hits          294      298       +4     
  Misses          3        3              

Impacted Files	Coverage Δ
xvec/accessor.py	100.00% <100.00%> (ø)

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