feat: improve gstack by adding the ability to generate a path based on the second FunctionId argument

[anatoly32322]

Feature Request

add the ability to generate a path based on the second FunctionID argument.

convert this:

func (*Conn) Method() {
  ...
  stack.FunctionID("", stack.Package("database/sql"))
  ...
}

to this:

func (*Conn) Method() {
  ...
  stack.FunctionID("database/sql.(*Conn).Method", stack.Package("database/sql"))
  ...
}

Describe Preferred Solution

Describe Alternatives

Related Code

Additional Context

If the feature request is approved, would you be willing to submit a PR?
Yes / No (Help can be provided if you need assistance submitting a PR)