initial changes for including arm64 binaries

[hsubramanianaks]

This PR is to support

• arm 64 binaries for 3 platforms linux, windows and macos as part of build systems so that CLI, extensions can use to download based on the arch.
• support arm architectures clusters (without these changes it would error: exec format error).
• update docker images for samples/todoapp to support both amd64 and arm64 architectures.
• update docker images for routingmanager, lpkremoteagent and lpkrestorationjob to support both amd64 and arm64 architectures.
• update envoy image to support both architectures.

Fixes
#291
#273

Internal Azure pipelines that is passing
https://devdiv.visualstudio.com/DevDiv/_build/results?buildId=8037558&view=logs&j=fd490c07-0b22-5182-fac9-6d67fe1e939b

Storage account screenshot:

• Tested with ARM cluster, B2K works fine.
• Tested with non-ARM cluster, B2k work fine.

[hsubramanianaks]

/ok-to-test sha=45e7116

[hsubramanianaks]

/ok-to-test sha=45e7116

[Tatsinnit]

🎊❤️☕️ Thank you so much for this, looks good, beside couple of comments:

• The arm64 solution is not for all portable arm distro given we don't have rasberrypi setup I am not sure if this will work on that distro.
• Secondly, we can open tracking item as a repercussion for various other linux-arm64 distro which needs minor tweaking which will mean more common-place solution in wider run.

Thank you so much all, and Hari for this.

[peterbom]

Looking good - thanks for your patience with me @hsubramanianaks!

[cxznmhdcxz]

@hsubramanianaks Tested on arm & x64 platform with arm arch clusters and the origin x64 clusters. The extension works fine.

[peterbom]

My only concern is noted here, but I think this can be addressed at a later stage.