micropython/bundles: Add a bundle-networking meta-package.

This is designed to be a common set of packages that all deployments with
networking support should include.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

micropython/bundles/README.md

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+These are "meta packages" designed to make it easy to provide defined
+bundles of related packages.
+
+For example, all deployments of MicroPython with networking support
+(WiFi/Ethernet) should add `require("bundle-networking")` to their
+`manifest.py` to ensure that the the standard set of networking packages
+(including HTTP requests, WebREPL, NTP, package management) are included.

micropython/bundles/bundle-networking/manifest.py

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+metadata(
+    version="0.1.0",
+    metadata="Common networking packages for all network-capable deployments of MicroPython.",
+)
+
+require("mip")
+require("ntptime")
+require("urequests")
+require("webrepl")