forwardingoptions_dhcprelay: use new provider via framework

[jeremmfr]

ENHANCEMENTS:

• resource/junos_forwardingoptions_dhcprelay: resource now use new terraform-plugin-framework
  some of config errors are now sent during Plan instead of during Apply
  optional boolean attributes doesn't accept value false
  optional string attributes doesn't accept empty value
  the resource schema has been upgraded to have one-blocks in single mode instead of list
• resource/junos_forwardingoptions_dhcprelay_group: resource now use new terraform-plugin-framework
  some of config errors are now sent during Plan instead of during Apply
  optional boolean attributes doesn't accept value false
  optional string attributes doesn't accept empty value
  the resource schema has been upgraded to have one-blocks in single mode instead of list
• resource/junos_forwardingoptions_dhcprelay_servergroup: resource now use new terraform-plugin-framework

BUG FIXES:

• resource/junos_bridge_domain: fix missing validate of not empty resource in create/update functions
• resource/junos_forwardingoptions_evpn_vxlan: fix missing validate of not empty resource in create/update functions
• resource/junos_ospf_area: fix missing part of validate config when version is null in config (default to v2)
• resource/junos_vlan: fix missing validate of not empty resource in create/update functions