[dev-tool] add command to type check files not being built by tshy

[jeremymeng]

In our current setup, tshy won't build test and samples-dev folder even they are
included in tsconfig.json. This PR adds a command that does the type-checking
for all files included in tsconfig.json, and allow additional files to be passed
in as well.

[qiaozha]

@wanlwanl Could you also help take a look at this? Thanks

[wanlwanl]

@wanlwanl Could you also help take a look at this? Thanks

@qiaozha , @MaryGao
SDK auto generation doesn't want sample & test's generation/check/run impact package building. So the sample and test related task is marked as optional, and their failures won't impact the SDK auto generation to continue.

Since this pr is creating new script, and it's not used in build script, the auto generation is not get impacted. So if the dev-tool run typecheck ... is not in build script, it'll not impact SDK auto generation

[jeremymeng]

@mpodwysocki @timovv any other feedback?

[MaryGao]

Approved and thanks for this!