add boilerplate for API generation tests

test/api_gen/run_test.py

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+# try to build manta instances from valid and invalid configuration files

test/api_gen/valid_configs/0_io_core.yaml

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+---
+cores:
+  my_io_core:
+    type: io
+
+    inputs:
+      btnu: 1
+      btnd: 1
+      btnl: 1
+      btnr: 1
+      btnc: 1
+      sw: 16
+
+    outputs:
+      led: 16
+      led16_b: 1
+      led16_g: 1
+      led16_r: 1
+      led17_b: 1
+      led17_g: 1
+      led17_r: 1
+
+uart:
+  port: "auto"
+  baudrate: 115200
+  clock_freq: 100000000

test/api_gen/valid_configs/1_logic_analyzer.yaml

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+---
+cores:
+  my_logic_analyzer:
+    type: logic_analyzer
+    sample_depth: 4096
+    
+    probes:
+      larry: 1
+      curly: 1
+      moe: 1
+      shemp: 4
+      
+    triggers:
+    - larry && curly && ~moe
+
+uart:
+  port: "auto"
+  baudrate: 115200
+  clock_freq: 100000000

test/api_gen/valid_configs/2_lut_ram.yaml

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+---
+cores:
+  my_lut_ram:
+    type: lut_ram 
+    size: 64 
+
+uart:
+  port: "auto"
+  baudrate: 115200
+  clock_freq: 100000000