Add crm sample data for snat/dnat/ipmc entries for Yang Model (#10865)

#### Why I did it
For yang model, sample_config_db.json file was missing Sample data for the features SNAT/DNAT/IPMC

#### How I did it
Added the SNAT,DNAT,IPMC(low Threshold/high threshold/threshold_type)entries in CRM table.

#### How to verify it
With sanity Build/test only.

src/sonic-yang-models/tests/files/sample_config_db.json

@@ -1112,12 +1112,21 @@
                 "acl_counter_high_threshold": "85",
                 "acl_counter_low_threshold": "70",
                 "acl_counter_threshold_type": "percentage",
+                "dnat_entry_threshold_type": "percentage",
+                "dnat_entry_high_threshold": "85",
+                "dnat_entry_low_threshold": "70",
+                "ipmc_entry_threshold_type": "percentage",
+                "ipmc_entry_high_threshold": "85",
+                "ipmc_entry_low_threshold": "70",
                 "ipv6_neighbor_high_threshold": "67",
                 "ipv6_neighbor_low_threshold": "56",
                 "ipv6_neighbor_threshold_type": "percentage",
                 "nexthop_group_high_threshold": "67",
                 "nexthop_group_low_threshold": "56",
                 "nexthop_group_threshold_type": "percentage",
+                "snat_entry_threshold_type": "percentage",
+                "snat_entry_high_threshold": "85",
+                "snat_entry_low_threshold": "70",
                 "polling_interval": "0"
             }
         },