fix(cli-support) Differentiate JS docs and TS docs when generating adapters

[Hywan]

A bug has been raised in
#2947, which is the
consequence of a bug introduced in
#2909.

This patch fixes it by differentiating JS docs and TS docs
clearly. The Context::push_setter and Context::push_getter methods
now receive a js_docs and a ts_docs, which prevent any confusions.

[Hywan]

Fail to build on rustc nightly because:

error: package time v0.3.10 cannot be built because it requires rustc 1.57.0 or newer, while the currently active rustc version is 1.56.0-nightly

because there is:

wasm-bindgen/.github/workflows/main.yml

Line 74 in af2a7b9

- run: rustup default nightly-2021-09-02

in some places.

@alexcrichton Which nightly versions are you willing to update to?

[joaofreires]

error: package time v0.3.10 cannot be built because it requires rustc 1.57.0 or newer, while the currently active rustc version is 1.56.0-nightly

Looks like this error is because the crate time launched a new release, tests prior the new version (using the crate time v0.3.9) were working fine.

https://crates.io/crates/time/versions

[alexcrichton]

Updating that nightly is fine to do at any time, it's just pinned to avoid breaking when rust releases a new nightly.

[joaofreires]

@alexcrichton I tested with nightly-2022-05-19 and all tests passed.