Move common values in packages/* tsconfig files to root TSConfig

[trivikr]

Is your feature request related to a problem? Please describe.
There are multiple values in packages/* tsconfig files which can be moved to root and only uncommon values can be overwritten.

For example,

• "strict": true is present in 81/85 packages
• "sourceMap": false is present in 81/85 packages
• "declaration": true is present in 84/85 packages
• "importHelpers": true is present in 83/85 packages
• "noEmitHelpers": true is present in 83/85 packages
• "inlineSourceMap": true is present in 81/85 packages
• "inlineSources": true is present in 81/85 packages

Describe the solution you'd like
Move these values to root TSConfig instead.

Describe alternatives you've considered
Sticking with most common TSConfig values defined in individual packages.

Additional context
This issue was noticed while updating target to ES2018 in packages/* in #1562

[github-actions]

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