[ASAP] feat: add experimentalDecorators compiler option

[eythaann]

Description of the Change

This PR introduces the experimentalDecorators option to the TypeScript compiler in the dnt project. This allows disabling legacy decorators, which are currently hardcoded as true

Problem

Currently, dnt enforces the use of legacy decorators, which conflicts with modern decorators. This causes errors both at compile time and runtime. For example:

This issue occurs because the emitted JavaScript relies on legacy decorators, which are incompatible with the expected behavior and types of modern decorators.

Solution

• Adds support for explicitly configuring the experimentalDecorators compiler option.
• The default behavior remains unchanged (legacy decorators enabled) to avoid breaking existing projects, but developers can now disable it as needed.

[CLAassistant]

All committers have signed the CLA.