Add new routes for remaining array functions

[Shelnutt2]

Add new routes for remaining array functions:

• tiledb_array_get_non_empty_domain
  • GET /v1/arrays/{organization}/{array_uri}/non_empty_domain
  • Returns object with array of domain and bool of is_empty
• tiledb_array_max_buffer_size
  • GET /v1/arrays/{organization}/{array_uri}/max_buffer_size?subarray=[],attribute="X"
  • Returns object with single uint64_t of size of buffer
• tiledb_array_max_buffer_size_var
  • GET /v1/arrays/{organization}/{array_uri}/max_buffer_size_var?subarray=[],attribute="X"
  • Returns object with a uint64_t of size of buffer, and a uint64_t for size of offset buffer.