Add Jamf host configuration

[damien-rivet]

Summary

Implements #64 by adding the basic element needed for configuring the URLRequest that will be returned / used later on by the framework.

Miscellaneous

Added SessionManager.
Added base request creation.
Added base errors.

[codecov]

Codecov Report

Merging #69 into develop will decrease coverage by 0.56%.
The diff coverage is 88.13%.

@@             Coverage Diff             @@
##           develop      #69      +/-   ##
===========================================
- Coverage    98.54%   97.97%   -0.57%     
===========================================
  Files           33       36       +3     
  Lines         1028     1087      +59     
===========================================
+ Hits          1013     1065      +52     
- Misses          15       22       +7

Impacted Files	Coverage Δ
JamfKit/Sources/Models/BaseObject.swift	100% <ø> (ø)	⬆️
JamfKit/Sources/Session/SessionManagerError.swift	100% <100%> (ø)
...mfKit/Sources/Session/SessionManagerRequests.swift	100% <100%> (ø)
JamfKit/Sources/Session/SessionManager.swift	79.41% <79.41%> (ø)

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