Support multiple vcpkg platform toolsets (v141 & v142) & explicit VSCode generator

[mraduldubey]

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

1. On Windows, we support Visual Studio 2017 & Visual Studio 2019. Both are different toolsets.
2. More importantly, Aprapipes pipeline does not support VCPKG_PLATFORM_TOOLSET v143. So, in case the users have an existing vcpkg setup (say, with VCPKG_PLATFORM_TOOLSET v143), the Aprapipes setup fails.
3. The build_windows*.bat scripts do not explicity mention the generators (-G option), which results in auto selection of the Visual Studio version.

Describe the solution you'd like

1. We should explicitly support VCPKG_PLATFORM_TOOLSET v141 and v142.
2. We should explicitly set generator option in our build scripts.

Describe alternatives you've considered

• Alternative to vcpkg issue was to set(VCPKG_PLATFORM_TOOLSET v142) in vcpkg/triplets/x86-windows.cmake.
• For multiple toolset version support: How to build package for mulitple versions of Visual Studio / multiple toolsets? microsoft/vcpkg#1207

Additional context
None