Transition some required dependencies into optional ones

Author: mdmintz

requirements.txt

@@ -106,22 +106,12 @@ pymysql==0.10.1;python_version<"3.6"
 pymysql==1.0.2;python_version>="3.6"
 pyotp==2.3.0;python_version<"3.6"
 pyotp==2.6.0;python_version>="3.6"
-boto==2.49.0
 cffi==1.15.1
 toml==0.10.2
-Pillow==6.2.2;python_version<"3.6"
-Pillow==8.4.0;python_version>="3.6" and python_version<"3.7"
-Pillow==9.2.0;python_version>="3.7"
 typing-extensions==3.10.0.2;python_version<"3.6"
 typing-extensions==4.1.1;python_version>="3.6" and python_version<"3.7"
 typing-extensions==4.2.0;python_version>="3.7" and python_version<"3.9"
 rich==12.5.1;python_version>="3.6" and python_version<"4.0"
-tornado==5.1.1;python_version<"3.6"
-tornado==6.1;python_version>="3.6" and python_version<"3.7"
-tornado==6.2;python_version>="3.7"
-pdfminer.six==20191110;python_version<"3.6"
-pdfminer.six==20211012;python_version>="3.6" and python_version<"3.7"
-pdfminer.six==20220524;python_version>="3.7"
 
 # --- Testing Requirements --- #
 # ("pip install -r requirements.txt" also installs this, but "pip install -e ." won't.)

setup.py

@@ -231,22 +231,12 @@
         'pymysql==1.0.2;python_version>="3.6"',
         'pyotp==2.3.0;python_version<"3.6"',
         'pyotp==2.6.0;python_version>="3.6"',
-        "boto==2.49.0",
         "cffi==1.15.1",
         "toml==0.10.2",
-        'Pillow==6.2.2;python_version<"3.6"',
-        'Pillow==8.4.0;python_version>="3.6" and python_version<"3.7"',
-        'Pillow==9.2.0;python_version>="3.7"',
         'typing-extensions==3.10.0.2;python_version<"3.6"',  # <3.9 for "rich"
         'typing-extensions==4.1.1;python_version>="3.6" and python_version<"3.7"',  # noqa: E501
         'typing-extensions==4.2.0;python_version>="3.7" and python_version<"3.9"',  # noqa: E501
         'rich==12.5.1;python_version>="3.6" and python_version<"4.0"',
-        'tornado==5.1.1;python_version<"3.6"',
-        'tornado==6.1;python_version>="3.6" and python_version<"3.7"',
-        'tornado==6.2;python_version>="3.7"',
-        'pdfminer.six==20191110;python_version<"3.6"',
-        'pdfminer.six==20211012;python_version>="3.6" and python_version<"3.7"',  # noqa: E501
-        'pdfminer.six==20220524;python_version>="3.7"',
     ],
     extras_require={
         # pip install -e .[coverage]
@@ -269,6 +259,18 @@
             'pycodestyle==2.5.0;python_version<"3.6"',
             'pycodestyle==2.8.0;python_version>="3.6"',
         ],
+        # pip install -e .[pdfminer]
+        "pdfminer": [
+            'pdfminer.six==20191110;python_version<"3.6"',
+            'pdfminer.six==20211012;python_version>="3.6" and python_version<"3.7"',  # noqa: E501
+            'pdfminer.six==20220524;python_version>="3.7"',
+        ],
+        # pip install -e .[pillow]
+        "pillow": [
+            'Pillow==6.2.2;python_version<"3.6"',
+            'Pillow==8.4.0;python_version>="3.6" and python_version<"3.7"',
+            'Pillow==9.2.0;python_version>="3.7"',
+        ],
     },
     packages=[
         "seleniumbase",