Add DBAPI2 compliant web-socket driver

In order to implement a web-socket based SQLA dialect for the Exasol-DB,
a DBAPI2 compliant web-socket driver is added. 

The current implementation of the driver is based on the `pyexasol` project
(If needed this can be changed in the future).

Additionally the unit and integration tests have been restructured
to simplify the test setup and execution. The restructuring is not completely done yet,
it rather should be seen as step towards the future layout/structure.

.gitattributes

@@ -1 +1,2 @@
-sqlalchemy_exasol/_version.py export-subst
+sqlalchemy_exasol/version.py        linguist-generated=true
+poetry.lock                         linguist-generated=true

.github/workflows/ci-cd.yml

@@ -57,7 +57,7 @@ jobs:
       - name: Install poetry
         uses: abatilo/actions-poetry@v2.1.5
         with:
-          poetry-version: 1.2.1
+          poetry-version: 1.2.2
 
       - name: Install python project dependencies
         run: poetry install
@@ -100,7 +100,7 @@ jobs:
       - name: Install poetry
         uses: abatilo/actions-poetry@v2.1.5
         with:
-          poetry-version: 1.2.1
+          poetry-version: 1.2.2
 
       - name: Install python project dependencies
         run: poetry install
@@ -117,7 +117,9 @@ jobs:
           ITDE_TAG: "0.11.0"
 
       - name: Run Test for Python ${{ matrix.python }} using ${{ matrix.connector }}
-        run: poetry run nox -s integration-tests -- -- --connector ${{ matrix.connector }} --db-version ${{ matrix.exasol_version }}
+        run: |
+          poetry run nox -s unit-tests
+          poetry run nox -s integration-tests -- -- --connector ${{ matrix.connector }} --db-version ${{ matrix.exasol_version }}
 
   upload_to_pypi:
     runs-on: ubuntu-latest
@@ -143,7 +145,7 @@ jobs:
       - name: Install poetry
         uses: abatilo/actions-poetry@v2.1.5
         with:
-          poetry-version: 1.2.1
+          poetry-version: 1.2.2
 
       - name: Install python project dependencies
         run: poetry install

.github/workflows/ci.yaml

@@ -61,7 +61,7 @@ jobs:
       - name: Install poetry
         uses: abatilo/actions-poetry@v2.1.5
         with:
-          poetry-version: 1.2.1
+          poetry-version: 1.2.2
 
       - name: Install python project dependencies
         run: poetry install
@@ -104,7 +104,7 @@ jobs:
       - name: Install poetry
         uses: abatilo/actions-poetry@v2.1.5
         with:
-          poetry-version: 1.2.1
+          poetry-version: 1.2.2
 
       - name: Install python project dependencies
         run: poetry install
@@ -121,7 +121,9 @@ jobs:
           ITDE_TAG: "0.11.0"
 
       - name: Run Test for Python ${{ matrix.python }} using ${{ matrix.connector }}
-        run: poetry run nox -s integration-tests -- -- --connector ${{ matrix.connector }} --db-version ${{ matrix.exasol_version }}
+        run: |
+          poetry run nox -s unit-tests
+          poetry run nox -s integration-tests -- -- --connector ${{ matrix.connector }} --db-version ${{ matrix.exasol_version }}
 
   build_package:
     runs-on: ubuntu-latest
@@ -147,7 +149,7 @@ jobs:
       - name: Install poetry
         uses: abatilo/actions-poetry@v2.1.5
         with:
-          poetry-version: 1.1.13
+          poetry-version: 1.2.2
 
       - name: Install python project dependencies
         run: poetry install

.github/workflows/gh-pages.yaml

@@ -12,8 +12,10 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v3
 
-      - name: Install Poetry
-        uses: snok/install-poetry@v1
+      - name: Install poetry
+        uses: abatilo/actions-poetry@v2.1.5
+        with:
+          poetry-version: 1.2.2
 
       - name: Set up Python
         uses: actions/setup-python@v4

.github/workflows/link-check.yaml

@@ -31,7 +31,7 @@ jobs:
       - name: Install poetry
         uses: abatilo/actions-poetry@v2.1.5
         with:
-          poetry-version: 1.2.1
+          poetry-version: 1.2.2
 
       - name: Install python project dependencies
         run: poetry install --no-root

changelog.d/20230306_161112_nicola.coretti__105_pyexasol_backend.rst

@@ -0,0 +1,35 @@
+.. A new scriv changelog fragment.
+..
+.. Uncomment the header that is right (remove the leading dots).
+..
+.. 🗑️ Removed
+.. ----------
+..
+.. - A bullet item for the Removed category.
+..
+✨ Added
+---------
+* Add websocket based dbapi2 compliant database driver
+..
+.. - A bullet item for the Added category.
+..
+.. 🔧 Changed
+.. -----------
+..
+.. - A bullet item for the Changed category.
+..
+.. 🚧 Deprecated
+.. --------------
+..
+.. - A bullet item for the Deprecated category.
+..
+.. 🐞 Fixed
+.. ---------
+..
+.. - A bullet item for the Fixed category.
+..
+.. 🔐 Security
+.. -----------
+..
+.. - A bullet item for the Security category.
+..