fix encodePacked DynamicBytes

[xutruth]

What does this PR do?

fix encodePacked DynamicBytes

In solidity, abi.encodePacked function is used to pack the given parameters into a tightly packed byte array without inserting length information. This function is commonly used for creating hashes or signatures of data in Solidity contracts, It does not align the data to 32 bytes like abi.encode.

//  ethers   ^6.10.0
import {AbiCoder, ethers} from "ethers";
let packed = ethers.solidityPacked(["bytes", "bytes"], ["0x12", "0x12"])
console.log(packed)  //0x1212

Where should the reviewer start?

1. TypeEncoder#encodePacked
2. DefaultFunctionEncoderTest#testEncodeConstructorPacked_multipleParameters
3. TypeEncoderPackedTest#testDynamicBytesEncodePacked

Why is it needed?

fix encodePacked DynamicBytes -> solidity bytes

Checklist

• I've read the contribution guidelines.
• I've added tests (if applicable).
• I've added a changelog entry if necessary.

[NickSneo]

@xutruth Thanks for contributing. Can you plz add a changelog entry for this?

[xutruth]

@xutruth Thanks for contributing. Can you plz add a changelog entry for this?

@NickSneo I have added chnagelog for this commit!

[NickSneo]

@xutruth Hey,

Can you add link to the references for examples or tests you added of encodePacked DynamicBytes.
I found these - https://docs.ethers.org/v6/api/hashing/#solidityPacked
https://docs.soliditylang.org/en/v0.8.14/abi-spec.html#non-standard-packed-mode

[xutruth]

I also refer to the official solidity documentation，v0.8.25, There are two sentences on how to encode strings and bytes

• Dynamically-sized types like string, bytes or uint[] are encoded without their length field.
• The encoding of string or bytes does not apply padding at the end, unless it is part of an array or struct (then it is padded to a multiple of 32 bytes).

but if use abi.encodePacked(struct) will be Error (9578): Type not supported in packed mode.

So I modified the handling of Utf8String and DynamicBytes，plz refer to this submission b1ad81b6 ，I added a comment “removePadding can also be used, but is not necessary“

[xutruth]

I also refer to the official solidity documentation，v0.8.25, There are two sentences on how to encode strings and bytes

• Dynamically-sized types like string, bytes or uint[] are encoded without their length field.
• The encoding of string or bytes does not apply padding at the end, unless it is part of an array or struct (then it is padded to a multiple of 32 bytes).

but if use abi.encodePacked(struct) will be Error (9578): Type not supported in packed mode.

So I modified the handling of Utf8String and DynamicBytes，plz refer to this submission b1ad81b6 ，I added a comment “removePadding can also be used, but is not necessary“

@NickSneo

[xutruth]

I also refer to the official solidity documentation，v0.8.25, There are two sentences on how to encode strings and bytes

• Dynamically-sized types like string, bytes or uint[] are encoded without their length field.
• The encoding of string or bytes does not apply padding at the end, unless it is part of an array or struct (then it is padded to a multiple of 32 bytes).

but if use abi.encodePacked(struct) will be Error (9578): Type not supported in packed mode.
So I modified the handling of Utf8String and DynamicBytes，plz refer to this submission b1ad81b6 ，I added a comment “removePadding can also be used, but is not necessary“

@NickSneo
In fact, I tried it in solidity, ethers.js, and web3.js

[NickSneo]

LGTM