refactor read options

[miller-time]

No description provided.

[miller-time]

examples:

• hq read -f

➜ hq read -f example.hcl '.some_block'
some_block "some_block_label" {
  attr = "value"
}
some_block "another_block_label" {
  attr = "another_value"
}

• ...which is identical to hq -f

➜ hq -f example.hcl '.some_block'
some_block "some_block_label" {
  attr = "value"
}
some_block "another_block_label" {
  attr = "another_value"
}

• hq read

➜ cat example.hcl | hq read '.some_block'
some_block "some_block_label" {
  attr = "value"
}
some_block "another_block_label" {
  attr = "another_value"
}

• ...which is identical to hq

➜ cat example.hcl | hq '.some_block'
some_block "some_block_label" {
  attr = "value"
}
some_block "another_block_label" {
  attr = "another_value"
}