fix(profiling): tighten ddup types [backport 2.7] (#8685)

Backport ded3a33 from #8668 to 2.7.

## Checklist

- [x] Change(s) are motivated and described in the PR description
- [x] Testing strategy is described if automated tests are not included
in the PR
- [x] Risks are described (performance impact, potential for breakage,
maintainability)
- [x] Change is maintainable (easy to change, telemetry, documentation)
- [x] [Library release note
guidelines](https://ddtrace.readthedocs.io/en/stable/releasenotes.html)
are followed or label `changelog/no-changelog` is set
- [x] Documentation is included (in-code, generated user docs, [public
corp docs](https://github.com/DataDog/documentation/))
- [x] Backport labels are set (if
[applicable](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting))
- [x] If this PR changes the public interface, I've notified
`@DataDog/apm-tees`.
- [x] If change touches code that signs or publishes builds or packages,
or handles credentials of any kind, I've requested a review from
`@DataDog/security-design-and-guidance`.

## Reviewer Checklist

- [x] Title is accurate
- [x] All changes are related to the pull request's stated goal
- [x] Description motivates each change
- [x] Avoids breaking
[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
changes
- [x] Testing strategy adequately addresses listed risks
- [x] Change is maintainable (easy to change, telemetry, documentation)
- [x] Release note makes sense to a user of the library
- [x] Author has acknowledged and discussed the performance implications
of this PR as reported in the benchmarks PR comment
- [x] Backport labels are set in a manner that is consistent with the
[release branch maintenance
policy](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting)

Co-authored-by: David Sanchez <[email protected]>

Author: github-actions[bot]

ddtrace/internal/datadog/profiling/ddup/_ddup.pyi

@@ -1,15 +1,18 @@
-import typing
+from typing import Dict
 from typing import Optional
+from typing import Union
 
 from ddtrace._trace.span import Span
 
+StringType = Union[str, bytes, None]
+
 def init(
-    env: Optional[str],
-    service: Optional[str],
-    version: Optional[str],
-    tags: Optional[typing.Dict[str, str]],
+    env: StringType,
+    service: StringType,
+    version: StringType,
+    tags: Optional[Dict[Union[str, bytes], Union[str, bytes]]],
     max_nframes: Optional[int],
-    url: Optional[str],
+    url: StringType,
 ) -> None: ...
 def upload() -> None: ...
 
@@ -20,13 +23,12 @@ class SampleHandle:
     def push_release(self, value: int, count: int) -> None: ...
     def push_alloc(self, value: int, count: int) -> None: ...
     def push_heap(self, value: int) -> None: ...
-    def push_lock_name(self, lock_name: str) -> None: ...
-    def push_frame(self, name: str, filename: str, address: int, line: int) -> None: ...
-    def push_threadinfo(self, thread_id: int, thread_native_id: int, thread_name: Optional[str]) -> None: ...
-    def push_taskinfo(self, task_id: int, task_name: str) -> None: ...
+    def push_lock_name(self, lock_name: StringType) -> None: ...
+    def push_frame(self, name: StringType, filename: StringType, address: int, line: int) -> None: ...
+    def push_threadinfo(self, thread_id: int, thread_native_id: int, thread_name: StringType) -> None: ...
+    def push_task_id(self, task_id: int) -> None: ...
+    def push_task_name(self, task_name: StringType) -> None: ...
     def push_exceptioninfo(self, exc_type: type, count: int) -> None: ...
-    def push_class_name(self, class_name: str) -> None: ...
-    def push_span(self, span: typing.Optional[Span], endpoint_collection_enabled: bool) -> None: ...
-    def flush_sample(
-        self,
-    ) -> None: ...
+    def push_class_name(self, class_name: StringType) -> None: ...
+    def push_span(self, span: Optional[Span], endpoint_collection_enabled: bool) -> None: ...
+    def flush_sample(self) -> None: ...