feat: add ListUsers configuration options

[miparnisari]

Description

Support three new configs for ListUsers:

• maxResults. If zero, we will try to retrieve all of them
• deadline. If zero, no deadline
• maxConcurrentReads. If zero, error.

TO DO: update benchmark introduced in #1555

Testing

# help test
[25/04/24 5:08:44] ~/GitHub/openfga (list-users-config-options) $ ./dist/openfga run --help | grep "[uU]sers"
      --experimentals enable-list-users                          a list of experimental features to enable. Allowed values: enable-list-users
      --listUsers-deadline duration                              the timeout deadline for serving ListUsers requests. If 0, there is no deadline (default 3s)
      --listUsers-max-results uint32                             the maximum results to return in non-streaming ListUsers API responses. If 0, all results can be returned (default 1000)
      --max-concurrent-reads-for-list-users uint32               the maximum allowed number of concurrent datastore reads in a single ListUsers query. A high number will consume more connections from the datastore pool and will attempt to prioritize performance for the request at the expense of other queries performance. (default 4294967295)

# validation of config options
[25/04/24 5:23:11] ~/GitHub/openfga (list-users-config-options) $ ./dist/openfga run --datastore-engine=memory
 --experimentals enable-list-users --max-concurrent-reads-for-list-users 0 --listUsers-max-results  1
 🚀  Building the OpenFGA binary within /Users/maria.inesparnisari/GitHub/openfga/dist/openfga  
panic: config 'maxConcurrentReadsForListUsers' cannot be 0

goroutine 1 [running]:
github.com/openfga/openfga/cmd/run.run(0x140000e6100?, {0x140003b0150?, 0x4?, 0x104cab275?})
        /Users/maria.inesparnisari/GitHub/openfga/cmd/run/run.go:256 +0xd8
github.com/spf13/cobra.(*Command).execute(0x140003e6300, {0x140003b00e0, 0x7, 0x7})
        /Users/maria.inesparnisari/go-mod-cache/github.com/spf13/cobra@v1.8.0/command.go:987 +0x828
github.com/spf13/cobra.(*Command).ExecuteC(0x140003e6000)
        /Users/maria.inesparnisari/go-mod-cache/github.com/spf13/cobra@v1.8.0/command.go:1115 +0x344
github.com/spf13/cobra.(*Command).Execute(0x140003e6000?)
        /Users/maria.inesparnisari/go-mod-cache/github.com/spf13/cobra@v1.8.0/command.go:1039 +0x1c
main.main()
        /Users/maria.inesparnisari/GitHub/openfga/cmd/openfga/main.go:28 +0x108
[25/04/24 5:23:24] ~/GitHub/openfga (list-users-config-options) $ 


# enforcement of max results
[25/04/24 5:23:52] ~/GitHub/openfga (list-users-config-options) $ make build &&  ./dist/openfga run --datastore-engine=memory --experimentals enable-list-users --max-concurrent-reads-for-list-users 1 --listUsers-max-results  1
 
// ... 

2024-04-25T17:24:09.615-0700    INFO    grpc_req_complete       {"grpc_service": "openfga.v1.OpenFGAService", "grpc_method": "ListUsers", "grpc_type": "unary", "request_id": "07e3b5bd-e39b-4726-95ea-4b209659f695", "user_agent": "PostmanRuntime/7.37.3", "raw_request": {"store_id":"01HV73AN9K9SVX8HG1FPPNZZSY","authorization_model_id":"","object":{"type":"group","id":"target"},"relation":"member","user_filters":[{"type":"user","relation":""}],"contextual_tuples":[],"context":null}, "raw_response": {"users":[{"object":{"type":"user","id":"a"}}],"excluded_users":[]}, "peer.address": "127.0.0.1:56116", "store_id": "01HV73AN9K9SVX8HG1FPPNZZSY", "authorization_model_id": "01HWBWKD6ZAG702PHTAGCRVH19", "grpc_code": 0}