Consider filtering options for the ListTasks endpoint

[buchanae]

Currently the ListTasksRequest contains a couple fields for filtering

message ListTasksRequest {

  // OPTIONAL
  //
  // Filter the task list to include tasks in this project.
  string project = 1;

  // OPTIONAL
  //
  // Filter the list to include tasks where the name matches this prefix.
  // If unspecified, no task name filtering is done.
string name_prefix = 2;

...

There have been suggestions for changing this:

• Remove project and name_prefix
• Allow filtering on Task.state and Task.tags

[buchanae]

92 is where most of the work is happening

[adamstruck]

The current proposal is reflected in #104. This approach would require a switch to OpenApi 3.0

[vsmalladi]

@kellrott has this been addressed by #170