fix: text length not computed properly

[RiccardoM]

Description

This PR fixes how the text lengths related to a Post or a FreeTextReactionValue are computed. Previously the count would only consider the byte size of the text. Instead, it's much better to count graphemes.

As per this comment:

There is a difference between bytes, runes, and graphemes, and it seems many people confuse the three. (In most use cases, it doesn't matter anyway.) For example, :rainbow_flag: (rainbow flag emoji) is 1 grapheme, 4 runes, and 14 bytes. The Go stdlib only has built-in functions for bytes and runes but not for graphemes.

By counting graphemes instead of runes or bytes, we can assure a consistent user experience with any application that implementes client-based char count.

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Commits

Files that changed from the base of the PR and between b085e046f84620833f82a08d5ed1f101b2af1ca6 and 036ca6bb52fe110bb83faef173764f5d9b1f5f82.

Walkthrough

The update introduces enhancements to the text length validation process for posts and reactions. Specifically, it adds methods to calculate the text length directly within the respective data structures (Post and FreeTextValue) and incorporates these methods into the validation logic. Additionally, new tests ensure these methods work correctly across various text scenarios.

Changes

Files	Change Summaries
.../keeper/posts.go, .../types/models.go, .../types/models_test.go	Updated ValidatePost to use GetTextLength(); added GetTextLength method and test in Post.
.../keeper/reactions.go, .../types/models.go, .../types/models_test.go	Updated validation to use GetLength(); added GetLength method and test in FreeTextValue.

"In the land of code where the snippets roam free,
A rabbit hopped in, as happy as can be. 🐇
With a flip and a hop, it refined the text check,
Making posts and reactions perfectly spec.
'Let's celebrate,' it said, with a cheerful decree,
For our code is now cleaner, as clean as can be!"
🎉🥕📝

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