Update build and typecheck scripts to use local Typescript

[bytrangle]

Currently, the build and typecheck scripts in contract directory will invoke the globally installed on the user's machine. If the globally installed Typescript is too old, it may throw an error such as:

Argument for '--target' option must be: 'es3', 'es5', 'es6', 'es2015', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'esnext'

es2022 is only allowed from Typescript 4.6 onwards.

To prevent errors, change the scripts to invoke the locally installed Typescript as specified in package.json.

[CLAassistant]

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1 out of 3 committers have signed the CLA.

✅ gilescope
❌ claudebarde
❌ bytrangle
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[gilescope]

Thanks - neat!