bors 537f9b311d Auto merge of #15160 - tetsuharuohzeki:enable-noUncheckedIndexedAccess, r=Veykril
editor/code: Enable `--noUncheckedIndexedAccess` & `--noPropertyAccessFromIndexSignature` ts option

This enables typescript's these option:

- [`--noUncheckedIndexedAccess`](https://www.typescriptlang.org/tsconfig#noUncheckedIndexedAccess)
    - This checks whether indexed access is not `null` (or `undefined`) strictly just as like checking by `std::option::Option::unwrap()`.
- [`--noPropertyAccessFromIndexSignature`](https://www.typescriptlang.org/tsconfig#noPropertyAccessFromIndexSignature)
    - This disallows `bar.foo` access if the `bar` type is `{ [key: string]: someType; }`.

----

Additionally, to enable `--noUncheckedIndexedAccess` easily, this pull request introduces [option-t](https://www.npmjs.com/package/option-t) as a dependency instead of defining a function in this repository like `unwrapUndefinable()` .

I'll remove it and define them byself if our dependency management policy is that to avoid to add a new package as possible.
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rust-analyzer is a modular compiler frontend for the Rust language. It is a part of a larger rls-2.0 effort to create excellent IDE support for Rust.

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