Allow SDKs to be specified as peer dependencies

[zFernand0]

Similar to the imperative package, we should allow other SDKs (core, files, ...) to be specified as peer dependencies and create hooks for them as part of the plugin loading process.

zowe-cli/packages/imperative/src/imperative/src/plugins/PluginManagementFacility.ts

Lines 160 to 163 in 5cbf6af

	PluginRequireProvider.createPluginHooks([
	PMFConstants.instance.IMPERATIVE_PKG_NAME,
	PMFConstants.instance.CLI_CORE_PKG_NAME
	]);

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[zFernand0]

Test the secrets-sdk to make sure that it can resolve the pre-builds.
Revise the conformance criteria to recommend peer+dev instead of regular-dev.
Check contributing guidelines for duplicate content.