feat: resolve entrypoint using import map

[bartlomieju]

This commit changes resolution of "entrypoint" to use import map
if one is provided for the following subcommands:

• "deno run"
• "deno doc"
• "deno check"
• "deno cache"

Closes #14066
Closes #19955

[bartlomieju]

After some back and forth I decided not to land it for v1.36.0. There are some edge cases that need to be carefully considered and the test coverage should be plenty. I will land it for v1.37.0.

[mash-graz]

Unfortunately this patch didn't get merged in one of the official releases until now and the issues mentioned in #19955, #14066 and #14760 are still unsolved.