1160: add exact amount display method

[lauchaves]

Description

• This PR fix issue #1160 from near-sdk

• Need to add the exact_amount_display method to format yoctoNEAR values for clearer error messages in near-sdk storage management.

Implementation

• Added exact_amount_display Method: it formats NearToken amounts for display as yoctoNEAR or NEAR.
• Based on exact-display implementation from near-cli-rs
• Added tests for various cases: zero value, small values, exact NEAR values, and fractional NEAR values.

Example Usage:

let required_cost = NearToken::from_yoctonear(15 * 10_u128.pow(23));
format!("Must attach {} to cover storage", required_cost.exact_amount_display())

[lauchaves]

@frol this one is ready for review!

[akorchyn]

LGTM

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[frol]

@lauchaves Great! Thank you for bringing tests to it as well!

Indeed, consider joining the @race-of-sloths

[lauchaves]

Hey @frol, @akorchyn, I didn't know about the Race of Sloths! I just joined, that's super cool! Thanks so much for the invite! 🦥🚀

[lauchaves]

@race-of-sloths pls, include my pr in the race!

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[race-of-sloths]

🔄 The PR has been merged.

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[frol]

@race-of-sloths score 2

[race-of-sloths]

🌟 Score recorded!

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[race-of-sloths]

✅ PR is finalized!

Your contribution is much appreciated with a final score of 2!
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