core: `getMultilineInput` not trimming whitespace

[bicstone]

Describe the bug
core.getInput is trimming whitespace by default, but core.getMultilineInput is not.
Also, core.getMultilineInput ignores trimWhitespace option.

To Reproduce

action.yml

# ...
inputs:
 option:
 description: a multiline option

index.js

import * as core from "@actions/core"

const option = core.getMultilineInput("option", {
 trimWhitespace: true,
})

core.info(option)

workflow.yml

# ...
jobs:
 test:
 # ...
 steps:
 - uses: # ...
 with:
 option: |-
 a 
 b 
 c 

-> ["a ", " b ", " c"]

Expected behavior
-> ["a", "b", "c"]