Add extreme value pp test (#6)

test/tests/postprocessors/gold/average.csv

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+time,avg_c
+0,0.8

test/tests/postprocessors/gold/extreme_value.csv

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+time,max_c,min_c
+0,3.2375,-1.6375

test/tests/postprocessors/gold/integral.csv

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+time,int_c
+0,4.8

test/tests/postprocessors/postprocessors.i

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+[Domain]
+  dim = 2
+  nx = 40
+  ny = 40
+  xmax = 2
+  ymax = 3
+  mesh_mode = DUMMY
+  device_names = cpu
+[]
+
+[TensorBuffers]
+  [c]
+  []
+[]
+
+[TensorComputes]
+  [Initialize]
+    [c]
+      type = ParsedCompute
+      buffer = c
+      extra_symbols = true
+      expression = -x+y+0.3
+    []
+  []
+[]
+
+[Postprocessors]
+  [min_c]
+    type = TensorExtremeValuePostprocessor
+    buffer = c
+    value_type = MIN
+    execute_on = 'INITIAL TIMESTEP_END'
+  []
+  [max_c]
+    type = TensorExtremeValuePostprocessor
+    buffer = c
+    value_type = MAX
+    execute_on = 'INITIAL TIMESTEP_END'
+  []
+  [avg_c]
+    type = TensorAveragePostprocessor
+    buffer = c
+    execute_on = 'INITIAL TIMESTEP_END'
+  []
+  [int_c]
+    type = TensorIntegralPostprocessor
+    buffer = c
+    execute_on = 'INITIAL TIMESTEP_END'
+  []
+[]
+
+[Problem]
+  type = TensorProblem
+[]
+
+[Executioner]
+  type = Transient
+  num_steps = 0
+[]
+
+[Outputs]
+  csv = true
+[]

test/tests/postprocessors/tests

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+[Tests]
+  [extreme_value]
+    type = CSVDiff
+    input = postprocessors.i
+    csvdiff = extreme_value.csv
+    cli_args = 'Outputs/file_base=extreme_value Postprocessors/active="min_c max_c"'
+    requirement = 'The system shall be able to determine the minimum and maximum item value in a tensor.'
+    issues = '#6'
+    design = 'TensorExtremeValuePostprocessor.md'
+  []
+
+  [average]
+    type = CSVDiff
+    input = postprocessors.i
+    csvdiff = average.csv
+    cli_args = 'Outputs/file_base=average Postprocessors/active="avg_c"'
+    requirement = 'The system shall be able to determine the average value in a tensor.'
+    issues = '#6'
+    design = 'TensorAveragePostprocessor.md'
+  []
+
+  [integral]
+    type = CSVDiff
+    input = postprocessors.i
+    csvdiff = integral.csv
+    cli_args = 'Outputs/file_base=integral Postprocessors/active="int_c"'
+    requirement = 'The system shall be able to compute the integral over a simulation cell tensor.'
+    issues = '#6'
+    design = 'TensorIntegralPostprocessor.md'
+  []
+[]