Moving ts-essentials to global dependencies

[mzkrasner]

• ts-essentials package needed for http-client (and other packages) to run, but had not previously been listed as package dependency in http-client package
• Moved to the SDK's global dependencies list (version matching based on usage across 4 other packages)
• Removed as local package dependencies from events, model-instance-handler, model-instance-protocol, and model-protocol

[stbrody]

seems reasonable to me but I don't really know much about TS transpilation. @ukstv could you possibly take a quick look at this?

CC @nathanielc

[ukstv]

It's all dev dependencies, so LGTM.