Support IBM Research BAM provider

examples/ibm-granite-vs-llama/README.md

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+To get started, set your BAM_API_KEY environment variable.
+
+Next, edit promptfooconfig.yaml.
+
+Then run:
+
+```
+promptfoo eval
+```
+
+Afterwards, you can view the results by running `promptfoo view`

examples/ibm-granite-vs-llama/promptfooconfig.yaml

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+
+description: 'IBM Granite vs Llama'
+
+prompts:
+  - 'Be consise. Answer this riddle :{{riddle}}'
+
+providers:
+  - id: bam:chat:meta-llama/llama-2-70b-chat
+    config:
+      temperature: 0.01 # minimum temperature
+      max_new_tokens: 1024
+      prompt:
+        prefix: '[INST] '
+        suffix: '[/INST] '
+  - id: bam:chat:ibm/granite-13b-chat-v2
+    config:
+      temperature: 0.01 # minimum temperature
+      max_new_tokens: 1024
+      prompt:
+        prefix: '[INST] '
+        suffix: '[/INST] '
+
+defaultTest:
+  assert:
+    - type: latency
+      threshold: 3000
+    - type: javascript
+      value: 'output.length <= 100 ? 1 : output.length > 1000 ? 0 : 1 - (output.length - 100) / 900'
+
+tests:
+  - vars:
+      riddle: >-
+        I am light as a feather, but even the world's strongest man couldn’t
+        hold me for much longer than a minute. What am I ?