adjust cmd class help parameters

[altendky]

Purpose:

presently you are only able to specify the click short help message for cmd classes. this short help is used when you checking --help on the group containing the command. this pr renames the exisitng parameter to short_help and adds a new parameter help (reusing the existing parameter name). the help parameter specifies the text used when you do --help on the command itself. both are required parameters.

Current Behavior:

New Behavior:

Testing Notes:

[coveralls-official]

Pull Request Test Coverage Report for Build 11964139834

Details

• 32 of 32 (100.0%) changed or added relevant lines in 4 files are covered.
• 15 unchanged lines in 9 files lost coverage.
• Overall coverage decreased (-0.003%) to 91.186%

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Files with Coverage Reduction	New Missed Lines	%
chia/daemon/keychain_proxy.py	1	73.16%
chia/farmer/farmer.py	1	72.52%
chia/server/node_discovery.py	1	79.45%
chia/daemon/client.py	1	74.01%
chia/daemon/server.py	1	83.22%
chia/wallet/wallet_node.py	1	88.33%
chia/full_node/full_node.py	1	86.06%
chia/rpc/rpc_server.py	4	88.2%
chia/full_node/weight_proof.py	4	90.48%

Totals
Change from base Build 11962414890:	-0.003%
Covered Lines:	103404
Relevant Lines:	113203

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💛 - Coveralls