ENH: add pickle support for Geography #365

Job	Run time
ubuntu-latest, 3.10, ci/environment.yml	55s
ubuntu-latest, 3.11, ci/environment.yml	50s
ubuntu-latest, 3.12, ci/environment.yml	49s
macos-latest, 3.10, ci/environment.yml	1m 5s
macos-latest, 3.11, ci/environment.yml	1m 12s
macos-latest, 3.12, ci/environment.yml	1m 0s
windows-latest, 3.10, ci/environment.yml	2m 40s
windows-latest, 3.11, ci/environment.yml	1m 51s
windows-latest, 3.12, ci/environment.yml	1m 42s
ubuntu-latest, 3.12, ci/environment-dev.yml	1m 34s
macos-latest, 3.12, ci/environment-dev.yml	1m 12s
windows-latest, 3.12, ci/environment-dev.yml	2m 42s
	17m 32s

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