fix(best-build): Allow custom plugins

[diervo]

Details

• Allow custom plugins to be defined
• Change plugins format
• Fix minor bug on mesager interactive output.

Does this PR introduce a breaking change?

• Yes
• No

Plugins config options API has changed:

Before

{
... 
plugins: {...}
}

After

{
... 
plugins: [
 'p1',
[['p2', { optionsP2 }]
]
}

[salesforce-best-lwc-internal]

Benchmark comparison

Base commit: 21cc9b5 | Target commit: 4cf1c39

benchmark	base(21cc9b5)	target(4cf1c39)	trend
object_keys.benchmark:stringify_parse	36.64 (± 0.63 ms)	35.89 (± 0.10 ms)	👍
object_keys.benchmark:deep_merge	28.90 (± 2.12 ms)	24.27 (± 0.14 ms)	👍
simple-item.benchmark:create_and_render	56.65 (± 1.37 ms)	51.57 (± 0.56 ms)	👍