feat: Provide support for scraping Azure Synapse workspace, Apache Spark & SQL pools

[tomkerkhove]

Signed-off-by: Tom Kerkhove kerkhove.tom@gmail.com

When implementing a new scraper; these tasks are completed:

• Implement configuration
• Implement validation
• Implement scraping
• Implement resource discovery
• Provide unit tests
• Test end-to-end
• Document scraper
• Add entry to changelog

Metrics output:

# HELP promitor_demo_synapse_apache_spark_apps_ended Amount of apps ended running on Apache Spark pool in Azure Synapse
# TYPE promitor_demo_synapse_apache_spark_apps_ended gauge
promitor_demo_synapse_apache_spark_apps_ended{resource_group="promitor-sources",subscription_id="0f9d7fea-99e8-4768-8672-06a28514f77e",resource_uri="subscriptions/0f9d7fea-99e8-4768-8672-06a28514f77e/resourceGroups/promitor-sources/providers/Microsoft.Synapse/workspaces/promitor-synapse/bigDataPools/sparkpool",instance_name="sparkpool",workspace_name="promitor-synapse",pool_name="sparkpool"} 0 1613500949918
# HELP promitor_demo_synapse_sql_pool_dwu_limit Amount of DWUs defined as limit for SQL pool in Azure Synapse
# TYPE promitor_demo_synapse_sql_pool_dwu_limit gauge
promitor_demo_synapse_sql_pool_dwu_limit{resource_group="promitor-sources",subscription_id="0f9d7fea-99e8-4768-8672-06a28514f77e",resource_uri="subscriptions/0f9d7fea-99e8-4768-8672-06a28514f77e/resourceGroups/promitor-sources/providers/Microsoft.Synapse/workspaces/promitor-synapse/sqlPools/sqlpool",instance_name="sqlpool",workspace_name="promitor-synapse",pool_name="sqlpool"} 100 1613500949918
# HELP promitor_demo_synapse_workspace_builtin_sql_processed_bytes Amount of bytes processed in Azure Synapse workspace
# TYPE promitor_demo_synapse_workspace_builtin_sql_processed_bytes gauge
promitor_demo_synapse_workspace_builtin_sql_processed_bytes{resource_group="promitor-sources",subscription_id="0f9d7fea-99e8-4768-8672-06a28514f77e",resource_uri="subscriptions/0f9d7fea-99e8-4768-8672-06a28514f77e/resourceGroups/promitor-sources/providers/Microsoft.Synapse/workspaces/promitor-synapse",instance_name="promitor-synapse",workspace_name="promitor-synapse"} 0 1613500949885

Discovery output:

[
  {
    "$type": "Promitor.Core.Contracts.ResourceTypes.SynapseApacheSparkPoolResourceDefinition, Promitor.Core.Contracts",
    "WorkspaceName": "promitor-synapse",
    "PoolName": "sparkpool",
    "ResourceType": "SynapseApacheSparkPool",
    "SubscriptionId": "0f9d7fea-99e8-4768-8672-06a28514f77e",
    "ResourceGroupName": "promitor-sources",
    "ResourceName": "sparkpool",
    "UniqueName": "promitor-synapse-sparkpool"
  }
]

Fixes #1477