Adds legacy chime, slack, custom webhook messages, request/response f#53

Merged

dbbaughe merged 9 commits intoopensearch-project:mainfrom

dbbaughe:notif-ism

Aug 13, 2021

Commits on Aug 13, 2021

Adds legacy chime, slack, custom webhook messages, request/response for publishing legacy notifications, and method for executing transport action
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Fixes import and removes username/password that is not used by ISM
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Throws error for toXContent for legacy notification response
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Renames legacy destination types to have legacy prefix
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Obfuscates message to remove from logs in toString method
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Makes destinationt type private and updates places to use getter
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Inlines destination type
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Makes base message content final
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Requires url to be defined in LegacyCustomWebhookMessage for use across transport wire and only writes the full url instead of each individual part
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