[dart:js_interop/ddc] Lower static interop using call-site and omit tear-offs

Since tear-offs of static interop members are disallowed, we can
avoid modifying external procedures and just modify the invocation
instead. This allows us to avoid emitting external procedures and
remove unnecessary tear-offs in DDC. It also results in more
concise calling code.

Call-site lowerings are implemented using closures that take args
from an existing invocation, and return a new inlined invocation.

Change-Id: I7585d8db0378c4058ad23d452e7f47ed960b194a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/303742
Reviewed-by: Nicholas Shahan <nshahan@google.com>
Commit-Queue: Srujan Gaddam <srujzs@google.com>
Reviewed-by: Joshua Litt <joshualitt@google.com>
Reviewed-by: Johnni Winther <johnniwinther@google.com>