Add pre-configured defaults for funding, dependabot, and pre-commit

.github/FUNDING.yml

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+# These are supported funding model platforms
+
+github: celery
+patreon:
+open_collective: celery
+ko_fi: # Replace with a single Ko-fi username
+tidelift: "pypi/celery"
+custom: # Replace with a single custom sponsorship URL

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+  - package-ecosystem: "pip"
+    directory: "/"
+    schedule:
+      interval: "daily"

.github/opencollective.yml

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+collective: celery
+tiers:
+    - tiers: '*'
+      labels: ['Backer ❤️']
+      message: 'Hey <author>. Thank you for supporting the project!:heart:'
+    - tiers: ['Basic Sponsor', 'Sponsor', 'Silver Sponsor', 'Gold Sponsor']
+      labels: ['Sponsor ❤️']
+      message: |
+        Thank you for sponsoring the project!:heart::heart::heart:
+        Resolving this issue is one of our top priorities.
+        One of @celery/core-developers will triage it shortly.
+invitation: |
+  Hey <author> :wave:,
+  Thank you for opening an issue. We will get back to you as soon as we can.
+  Also, check out our [Open Collective](<link>) and consider backing us - every little helps!
+
+  We also offer priority support for our sponsors.
+  If you require immediate assistance please consider sponsoring us.

.pre-commit-config.yaml

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+# Learn more about this config here: https://pre-commit.com/
+
+# To enable these pre-commit hooks run:
+# `brew install pre-commit` or `python3 -m pip install pre-commit`
+# Then in the project root directory run `pre-commit install`
+
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v5.0.0
+    hooks:
+      - id: check-builtin-literals
+      - id: check-executables-have-shebangs
+      - id: check-shebang-scripts-are-executable
+      - id: check-toml
+      - id: check-yaml
+      - id: detect-private-key
+      - id: end-of-file-fixer
+      - id: mixed-line-ending
+      - id: trailing-whitespace