[COST-1847] unleash client for trino enablement

[maskarb]

This PR adds the unleash client and allows us to utilize Unleash to enable trino processing for account/schema numbers. All the other mechanisms in place to enable trino processing will still work, so any ENABLE_TRINO_SOURCES, ENABLE_TRINO_SOURCE_TYPE, or ENABLE_TRINO_ACCOUNTS that are already defined will function the same way.

Adding the unleash client here allows us to add new accounts without the hassle of updating the deploy.yaml in app-interface.

Testing:
(this is easier to see without trino running)

1. make remove-db
2. make docker-up-min
3. make create-test-customer
4. make load-test-customer
5. See the everything succeeds
6. Delete all sources and cost models from the db (yea, this is a pain)
7. Log into unleash (http://localhost:4242/) and add acct10001 to the schema-name list in the schema-strategy for the cost-trino-processor feature flag
8. recreate the test customers and load in data
9. watch everything fail to ingest (because all data is going thru trino and trino is not running)

Smokes:
Manually ran the 2 failures:

$ iqe tests plugin cost_management -k test_api_ocp_source_crud_upload_service  -m cost_smoke
1 passed, 6120 deselected, 5 warnings in 224.55s (0:03:44)
$ iqe tests plugin cost_management -k test_api_ocp_sources_shared_rates_recalculation -m cost_smoke
1 passed, 6120 deselected, 5 warnings in 31.30s

[maskarb]

/retest

[codecov]

Codecov Report

Merging #3163 (63e2617) into main (670e19c) will decrease coverage by 0.0%.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##            main   #3163     +/-   ##
=======================================
- Coverage   94.0%   94.0%   -0.0%     
=======================================
  Files        308     308             
  Lines      26172   26170      -2     
  Branches    2975    2974      -1     
=======================================
- Hits       24596   24592      -4     
- Misses       997    1000      +3     
+ Partials     579     578      -1     

[maskarb]

/retest

[maskarb]

/retest

[maskarb]

/retest

[adberglund]

Approved with a suggestion on formatting the JSON file

[adberglund]

Suggested change

	{"version":1,"features":[{"name":"cost-trino-processor","description":"Toggle to enable trino processing","type":"permission","project":"default","enabled":true,"stale":false,"strategies":[{"name":"schema-strategy","parameters":{"schema-name":""},"constraints":[]}],"variants":[],"createdAt":"2021-09-14T21:22:00.756Z"}],"strategies":[{"name":"schema-strategy","description":"Enablement based on account/schema number","parameters":[{"name":"schema-name","type":"list","description":"values must begin with `acct`","required":false}]}]}
	{
	"version": 1,
	"features": [
	{
	"name": "cost-trino-processor",
	"description": "Toggle to enable trino processing",
	"type": "permission",
	"project": "default",
	"enabled": true,
	"stale": false,
	"strategies": [
	{
	"name": "schema-strategy",
	"parameters": {
	"schema-name": ""
	},
	"constraints": []
	}
	],
	"variants": [],
	"createdAt": "2021-09-14T21:22:00.756Z"
	}
	],
	"strategies": [
	{
	"name": "schema-strategy",
	"description": "Enablement based on account/schema number",
	"parameters": [
	{
	"name": "schema-name",
	"type": "list",
	"description": "values must begin with `acct`",
	"required": false
	}
	]
	}
	]
	}

[maskarb]

The main reason why I didn't format this file is that we won't modify it directly. We should be exporting the flags from the unleash DB using make unleash-export. But! I updated that make command to format the file on export, so it should be readable now.

[maskarb]

/retest