[SQL] adding failover groups to swagger and changing failoverGroupId type

[AutorestCI]

Generated from RestAPI PR: Azure/azure-rest-api-specs#1181

[codecov-io]

Codecov Report

Merging #1136 into master will decrease coverage by 0.11%.
The diff coverage is 25.43%.

@@            Coverage Diff             @@
##           master    #1136      +/-   ##
==========================================
- Coverage   55.14%   55.03%   -0.12%     
==========================================
  Files        2162     2168       +6     
  Lines       60328    60559     +231     
==========================================
+ Hits        33269    33327      +58     
- Misses      27059    27232     +173

Impacted Files	Coverage Δ
azure-mgmt-sql/azure/mgmt/sql/models/database.py	100% <ø> (ø)	⬆️
.../mgmt/sql/operations/failover_groups_operations.py	10.79% <10.79%> (ø)
...e-mgmt-sql/azure/mgmt/sql/sql_management_client.py	100% <100%> (ø)	⬆️
azure-mgmt-sql/azure/mgmt/sql/models/__init__.py	100% <100%> (ø)	⬆️
...ure/mgmt/sql/models/sql_management_client_enums.py	100% <100%> (ø)	⬆️
...ure-mgmt-sql/azure/mgmt/sql/operations/__init__.py	100% <100%> (ø)	⬆️
azure-mgmt-sql/azure/mgmt/sql/version.py	100% <100%> (ø)	⬆️
...e-mgmt-sql/azure/mgmt/sql/models/failover_group.py	35.71% <35.71%> (ø)
...ure-mgmt-sql/azure/mgmt/sql/models/partner_info.py	62.5% <62.5%> (ø)
...t/sql/models/failover_group_read_write_endpoint.py	66.66% <66.66%> (ø)
... and 8 more

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[lmazuel]

In #1193