Simplify toString() implementations in Integer and Long

[wenshao]

With the introduction of String.newStringWithLatin1Bytes, we can use it to simplify the toString methods of Integer and Long. By replacing the implementation that supports COMPACT_STRING = false with newStringWithLatin1Bytes, we gain the following benefits:
1. Simplified implementation
2. Strings with codeSize < 35 in Integer.toString(int) and Long.toString(long) can be inlined in C1, improving performance in early calls.
To make it easier to understand my proposal, I created a draft PR and hope to get your feedback. https://github.com/openjdk/jdk/pull/27929 <https://github.com/openjdk/jdk/pull/27929 >
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Shaojin Wen
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