Update VS Code engine to match active Node LTS version

[t1m0thyj]

Is your feature request related to a problem? Please describe.

Zowe Explorer V3 supports VS Code 1.79 (which ships with Node 16) and newer. Since Zowe Explorer depends on Zowe Node SDKs, the SDKs must support the same minimum version of Node.

This conflicts with the current policy of Zowe CLI and Node SDKs to support only active LTS versions of Node.

Describe the solution you'd like

Update the engine in package.json to 1.90 instead of 1.79:

zowe-explorer-vscode/packages/zowe-explorer/package.json

Lines 2066 to 2068 in 61b4439

	"engines": {
	"vscode": "^1.79.0"
	},

Also update the Zowe docs to mention VS Code 1.90 and Node 20 which is currently the active LTS.

Describe alternatives you've considered

Additional context

Going forward, on minor releases of ZE we plan to update the VS Code engine whenever the oldest active Node LTS version reaches End of Life.

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