Show Scaladoc for inner methods and values on hover (Scala 3)

[kasiaMarek]

Is your feature request related to a problem? Please describe.

Sometimes when methods are long and have multiple local definitions, it would be useful if Metals showed Scaladoc for local definitions on hover.

Describe the solution you'd like

/** Ooopsie daisy */
def computeLogicOwners(): Unit =
  /** This is a comment */
  val logicOwners = ???

Currently hover on logicOwners shows:

val logicOwners: Nothing

with this feature it would show:

val logicOwners: Nothing
This is a comment 

Possible mechanism

Docstrings are currently collected in Metals using Mtags but for local symbols, we should be able to get them from pc directly.

Describe alternatives you've considered

Using go to definition to find the definition of local symbol and reading the attached Scaladoc/comment.

Additional context

Original issue: scalameta/metals#7093

Search terms

hover scaladoc local