Add support for converting sessions to / from ASN1 representation #1007

Job	Run time
py312-cryptographyMain on ubuntu-rolling	1m 47s
py37	37s
py38	1s
py39	37s
py310	1s
py311	40s
py312	38s
py313	38s
pypy3	36s
pypy3	38s
py311-useWheel on windows-2022	24s
py37-cryptographyMain	38s
py38-cryptographyMain	37s
py39-cryptographyMain	36s
py310-cryptographyMain	40s
py311-cryptographyMain	39s
py312-cryptographyMain	39s
py313-cryptographyMain	38s
pypy3-cryptographyMain	36s
pypy3-cryptographyMain	36s
py37-cryptographyMinimum	1s
py38-cryptographyMinimum	37s
py39-cryptographyMinimum	37s
py310-cryptographyMinimum	39s
py311-cryptographyMinimum	39s
py312-cryptographyMinimum	39s
py313-cryptographyMinimum	38s
pypy3-cryptographyMinimum	38s
py39-cryptographyMinimum-useWheel	22s
py39-useWheel	24s
py39-randomorder	36s
py311-twistedTrunk	38s
check-manifest	13s
lint	11s
py311-mypy	10s
docs	38s
all-green	2s
	19m 58s

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