docs: add migration guide for const to function manager providers

[davidlj95]

Issue or need

In #1004 / #1005 a deprecation with schematics is introduced due to #960. Users may look in docs on how to fix the deprecated symbols

More docs could be added to inform about more deprecations.

Proposed changes

In order to keep users informed about how to automatically (or manually) migrate, add a new section in docs to inform about that.

Emoji chosen for deprecations is the same one as rust. To avoid choosing emojis at random. See rust-lang/rust#67872

Quick reminders

• 🤝 I will follow Code of Conduct
• ✅ No existing pull request already does almost same changes
• 👁️ Contributing docs are something I've taken a look at
• 📝 Commit messages convention has been followed
• 💬 TSDoc comments have been added or updated indicating API visibility if API surface has changed.
• 🧪 Tests have been added if needed. For instance, if adding new features or fixing a bug. Or removed if removing features.
• ⚙️ API Report has been updated if API surface is altered.

[davidlj95]

• docs: add migration guide for const to function manager providers #1013 👈 (View in Graphite)
• main

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[github-actions]

📦 Bundle size (Angular v17)

Git ref: 8e8e3340d03b08a8d332ee6bc5dc2987f0818518

Module file	Size	Base size	Difference
ngx-meta-core.mjs	3205 bytes (3.2KiB)	3205 bytes (3.2KiB)	No change
ngx-meta-json-ld.mjs	219 bytes (219B)	219 bytes (219B)	No change
ngx-meta-open-graph.mjs	1033 bytes (1.1KiB)	1033 bytes (1.1KiB)	No change
ngx-meta-routing.mjs	394 bytes (394B)	394 bytes (394B)	No change
ngx-meta-standard.mjs	943 bytes (943B)	943 bytes (943B)	No change
ngx-meta-twitter-card.mjs	539 bytes (539B)	539 bytes (539B)	No change
Total	6333 bytes (6.2KiB)	6333 bytes (6.2KiB)	No change

[github-actions]

📦 Bundle size (Angular v16)

Git ref: 8e8e3340d03b08a8d332ee6bc5dc2987f0818518

Module file	Size	Base size	Difference
ngx-meta-core.mjs	3411 bytes (3.4KiB)	3411 bytes (3.4KiB)	No change
ngx-meta-json-ld.mjs	193 bytes (193B)	193 bytes (193B)	No change
ngx-meta-open-graph.mjs	804 bytes (804B)	804 bytes (804B)	No change
ngx-meta-routing.mjs	379 bytes (379B)	379 bytes (379B)	No change
ngx-meta-standard.mjs	739 bytes (739B)	739 bytes (739B)	No change
ngx-meta-twitter-card.mjs	470 bytes (470B)	470 bytes (470B)	No change
Total	5996 bytes (5.9KiB)	5996 bytes (5.9KiB)	No change

[github-actions]

📦 Bundle size (Angular v15)

Git ref: 8e8e3340d03b08a8d332ee6bc5dc2987f0818518

Module file	Size	Base size	Difference
ngx-meta-core.mjs	3386 bytes (3.4KiB)	3386 bytes (3.4KiB)	No change
ngx-meta-json-ld.mjs	198 bytes (198B)	198 bytes (198B)	No change
ngx-meta-open-graph.mjs	804 bytes (804B)	804 bytes (804B)	No change
ngx-meta-routing.mjs	373 bytes (373B)	373 bytes (373B)	No change
ngx-meta-standard.mjs	739 bytes (739B)	739 bytes (739B)	No change
ngx-meta-twitter-card.mjs	412 bytes (412B)	412 bytes (412B)	No change
Total	5912 bytes (5.8KiB)	5912 bytes (5.8KiB)	No change

[github-actions]

📦 Bundle size (Angular v18)

Git ref: 8e8e3340d03b08a8d332ee6bc5dc2987f0818518

Module file	Size	Base size	Difference
ngx-meta-core.mjs	3205 bytes (3.2KiB)	3205 bytes (3.2KiB)	No change
ngx-meta-json-ld.mjs	219 bytes (219B)	219 bytes (219B)	No change
ngx-meta-open-graph.mjs	1033 bytes (1.1KiB)	1033 bytes (1.1KiB)	No change
ngx-meta-routing.mjs	394 bytes (394B)	394 bytes (394B)	No change
ngx-meta-standard.mjs	943 bytes (943B)	943 bytes (943B)	No change
ngx-meta-twitter-card.mjs	539 bytes (539B)	539 bytes (539B)	No change
Total	6333 bytes (6.2KiB)	6333 bytes (6.2KiB)	No change

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (7d91ee6) to head (8e8e334).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1013   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           90        90           
  Lines          440       440           
  Branches        49        49           
=========================================
  Hits           440       440           

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