ENH: add pickle support for Geography #371

Job	Run time
ubuntu-latest, 3.10, ci/environment.yml	53s
ubuntu-latest, 3.11, ci/environment.yml	55s
ubuntu-latest, 3.12, ci/environment.yml	49s
macos-latest, 3.10, ci/environment.yml	1m 10s
macos-latest, 3.11, ci/environment.yml	1m 10s
macos-latest, 3.12, ci/environment.yml	46s
windows-latest, 3.10, ci/environment.yml	3m 11s
windows-latest, 3.11, ci/environment.yml	2m 35s
windows-latest, 3.12, ci/environment.yml	2m 33s
ubuntu-latest, 3.12, ci/environment-dev.yml	1m 32s
macos-latest, 3.12, ci/environment-dev.yml	1m 53s
windows-latest, 3.12, ci/environment-dev.yml	2m 48s
	20m 15s

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