Contributed stubs for slugify package (#4429)

Co-authored-by: Eric Traut <erictr@microsoft.com>
Co-authored-by: Shantanu <12621235+hauntsaninja@users.noreply.github.com>

third_party/2and3/slugify/__init__.pyi

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+from .slugify import *
+from .special import *

third_party/2and3/slugify/slugify.pyi

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+from typing import Iterable, Optional
+
+def smart_truncate(
+    string: str, max_length: int = ..., word_boundary: bool = ..., separator: str = ..., save_order: bool = ...
+) -> str: ...
+def slugify(
+    text: str,
+    entities: bool = ...,
+    decimal: bool = ...,
+    hexadecimal: bool = ...,
+    max_length: int = ...,
+    word_boundary: bool = ...,
+    separator: str = ...,
+    save_order: bool = ...,
+    stopwords: Iterable[str] = ...,
+    regex_pattern: Optional[str] = ...,
+    lowercase: bool = ...,
+    replacements: Iterable[str] = ...,
+) -> str: ...

third_party/2and3/slugify/special.pyi

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+from typing import Sequence, Tuple
+
+def add_uppercase_char(char_list: Sequence[Tuple[str, str]]) -> Sequence[Tuple[str, str]]: ...
+
+CYRILLIC: Sequence[Tuple[str, str]]
+GERMAN: Sequence[Tuple[str, str]]
+GREEK: Sequence[Tuple[str, str]]
+PRE_TRANSLATIONS: Sequence[Tuple[str, str]]