WD02 for CN01 of the JADN-IM-CN

This release is for the WD to be presented for approval at the April 2023 OpenC2 TC meeting for publication as CN01.

What's Changed

• Improve Background, Motivation, Terminology by @dlemire60 in #19
• Improve Type and Field option content by @dlemire60 in #20
• Add Serialization Discussion by @dlemire60 in #22
• More info on "format" option by @dlemire60 in #23
• Change entity to message by @davaya in #24
• Misc Editorial Changes by @dlemire60 in #25
• Section 1 and 2 updates by @dlemire60 in #26
• Section 3.1 Updates by @dlemire60 in #28
• Revise Section 3.2 by @dlemire60 in #29
• Revise section 3.3 by @dlemire60 in #30
• Populate Section 4 by @dlemire60 in #27
• Admin clean up by @dlemire60 in #31
• update date in sample reference by @dlemire60 in #33
• Minor fixes by @dlemire60 in #34
• Editorial CorrectionsWorking by @dlemire60 in #35

Full Changelog: CN01-WD01...CN01-WD02a