Werk #15655: host: addition of show single host endpoint

Component	REST API
Title	host: addition of show single host endpoint
Date	May 2, 2023
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.3.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

Prior to this werk, the list hosts collection endpoint returned hosts which also included a link to the respective host. Following those links returned an error as the endpoint did not exist. This is now added with this werk.

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