[feat] Integrate BrowserGym (#1452)

* add a single-threaded server serving browsergym

* update poetry

* update browser page content

* add import to make sure browsergym environments are registered properly

* remove flask server, use multiprocess impl and Pipe

* fix

* refactor BrowserEnv

* update browser action and obs to include more complete info

* fix screenshot

* update poetry lock

* add playwright install to workflow

* update

* add better html to text conversion

* update for better text conversion to maintain parity with the current handling of browseurlaction

* update

* update poetry

* update multiprocessing mp

* fix multiprocessing

* update

* update github workflow

---------

Co-authored-by: Xingyao Wang <xingyao6@illinois.edu>

.github/workflows/dummy-agent-test.yml

@@ -15,6 +15,7 @@ jobs:
         run: |
           curl -sSL https://install.python-poetry.org | python3 -
           poetry install --without evaluation
+          poetry run playwright install --with-deps chromium
           wget https://huggingface.co/BAAI/bge-small-en-v1.5/raw/main/1_Pooling/config.json -P /tmp/llama_index/models--BAAI--bge-small-en-v1.5/snapshots/5c38ec7c405ec4b44b94cc5a9bb96e735b38267a/1_Pooling/
       - name: Run tests
         run: |