refactor(core)!: move ParseCoins to client/v2/internal

[tac0turtle]

Description

This pr moves parse coins to client/v2/internal, where it is used

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• included the necessary unit and integration tests
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[coderabbitai]

Walkthrough

The Cosmos SDK has undergone a reorganization, particularly affecting the handling of coins. The coin.ParseCoin function and related coin formatting utilities have been moved from the core package to an internal package within the client/v2 directory. This shift suggests a refactoring effort to internalize coin-related functionalities, likely for encapsulation or modularization purposes. As a result, import paths and function usages have been updated across various test and implementation files to align with the new structure.

Changes

File	Summary
client/v2/autocli/flag/coin.go client/v2/internal/coins/format_test.go	Changed import paths from "cosmossdk.io/core/coins" to "cosmossdk.io/client/v2/internal/coins".
core/CHANGELOG.md	Updated documentation to reflect the movement of coin.ParseCoin to client/v2/internal.
x/tx/signing/textual/coins_test.go	Removed import for cosmossdk.io/core/coins and updated function calls from coins.FormatCoins to textual.FormatCoins.

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[julienrbrt]

ACK