feat: api command should extract source code of api elements (#1111)

Closes #1106.

### Summary of Changes
added an attribute `code` to functions and classes that contain the
unformatted source code of the function or class


### Testing Instructions

run `package-parser api -p sklearn -o ./out` and compare the output with
the original file that the element contains.
`package-parser annotations -a ../data/api/sklearn__api.json -u
../data/usages/sklearn_usages_counts.json -o ./out/annotations.json` can
verify that no error occur if the file is loaded.

Co-authored-by: Aclrian <[email protected]>
Co-authored-by: Lars Reimann <[email protected]>
Co-authored-by: lars-reimann <[email protected]>

Author: Aclrian

.pylintrc

@@ -0,0 +1,39 @@
+[MESSAGES CONTROL]
+
+# Disable the message, report, category or checker with the given id(s). You
+# can either give multiple identifiers separated by comma (,) or put this
+# option multiple times (only on the command line, not in the configuration
+# file where it should appear only once). You can also use "--disable=all" to
+# disable everything first and then re-enable specific checks. For example, if
+# you want to run only the similarities checker, you can use "--disable=all
+# --enable=similarities". If you want to run only the classes checker, but have
+# no Warning level messages displayed, use "--disable=all --enable=classes
+# --disable=W".
+disable=
+    # Default generated
+    bad-inline-option,
+    deprecated-pragma,
+    file-ignored,
+    locally-disabled,
+    raw-checker-failed,
+    suppressed-message,
+    useless-suppression,
+    use-symbolic-message-instead,
+    # Disabled in pylint repo
+    attribute-defined-outside-init,
+    fixme,
+    invalid-name,
+    missing-docstring,
+    protected-access,
+    too-few-public-methods,
+    # Handled by black
+    format,
+    # Handled by isort
+    wrong-import-order,
+    # False positives
+    import-error,
+    # Unwanted
+    design,
+    metrics,
+    logging-fstring-interpolation,
+    too-many-nested-blocks

data/api/scikit-learn license

@@ -0,0 +1,29 @@
+BSD 3-Clause License
+
+Copyright (c) 2007-2022 The scikit-learn developers.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of the copyright holder nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.