Feature: Node replacement with withKlass example

[Shopiley]

Description

This PR adds an editor example that uses Lexical's node replacement feature to the /examples directory in the repo. The plan is to make a stackblitz sandbox out of this for the node replacement doc.

Related to #6398

Test plan

Before

• No example demonstrating the node replacement feature was present in the /examples directory.

After

• A functional example demonstrating node replacement is available in the /examples directory.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
lexical	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 10, 2024 6:57pm
lexical-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 10, 2024 6:57pm

[github-actions]

size-limit report 📦

Path	Size
lexical - cjs	31.18 KB (0%)
lexical - esm	31 KB (0%)
@lexical/rich-text - cjs	40.15 KB (0%)
@lexical/rich-text - esm	32.83 KB (0%)
@lexical/plain-text - cjs	38.79 KB (0%)
@lexical/plain-text - esm	30.15 KB (0%)
@lexical/react - cjs	42 KB (0%)
@lexical/react - esm	34.23 KB (0%)

[etrepum]

Are you planning to continue working on this PR, or should it be closed?

[Shopiley]

Are you planning to continue working on this PR, or should it be closed?

Hi, yes I plan to continue. Got stuck over some lint errors but I’ll get back to it this week.