* Add time range parameters to labels API

Signed-off-by: Kemal Akkoyun <kakkoyun@gmail.com>

* Fix minor issues

Signed-off-by: Kemal Akkoyun <kakkoyun@gmail.com>

* Add range to explore component

Signed-off-by: Kemal Akkoyun <kakkoyun@gmail.com>

* Add range to query component

Signed-off-by: Kemal Akkoyun <kakkoyun@gmail.com>

* Cache metric names for time range

Signed-off-by: Kemal Akkoyun <kakkoyun@gmail.com>

* Update public/app/plugins/datasource/prometheus/components/PromQueryField.tsx

Co-authored-by: Ivana Huckova <30407135+ivanahuckova@users.noreply.github.com>

* Remove unused method

Signed-off-by: Kemal Akkoyun <kakkoyun@gmail.com>

* Only compare the ranges

Signed-off-by: Kemal Akkoyun <kakkoyun@gmail.com>

* Update public/app/plugins/datasource/prometheus/components/PromQueryField.tsx

Co-authored-by: Ivana Huckova <30407135+ivanahuckova@users.noreply.github.com>

Co-authored-by: Ivana Huckova <30407135+ivanahuckova@users.noreply.github.com>