Add optional names to Steps

[mmcgr]

Add an optional name to steps.

@test_rel(query="def", include_stdlib=false, inputs=Dict(:a=>[1,2]))

=>

Test Summary:                   | Pass  Fail  Total   Time
REPL[2]:1 @ REPL[2]:1           |    8     1      9  39.5s
  configuration                 |    3            3  32.1s
  inputs                        |    3            3   1.4s
  REPL[2]:1 @ REPL[2]:1 - step3 |    2     1      3   4.8s```

@test_rel(steps=[
    Step(name="before-test-1", query="def insert[:a] {1}"),
    Step(name="before-test-2", query="def insert[:b] {2}"), 
    Step(query="def insert[:c] { a + a }"),
    Step(name="validation-1", query="ic () requires { c = 3 }"),
])

=>

Test Summary:                   | Pass  Fail  Total   Time
REPL[5]:1 @ REPL[5]:1           |   11     1     12  12.9s
  before-test-1                 |    3            3   1.2s
  before-test-2                 |    3            3   1.1s
  REPL[5]:1 @ REPL[5]:1 - step3 |    3            3   1.7s
  validation-1                  |    2     1      3   8.5s

[mcmcgrath13]

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