Bug: Panic when append entry to ReadWriteSegment

[lsytj0413]

Example code:

func TestSegmentAppendPanic(t *testing.T) {
	basePath := t.TempDir()
	rw, err := newReadWriteSegment(basePath, 0, 1024, 0, nil)
	assert.NoError(t, err)
	for i := int64(0); i < 100; i++ {
		err := rw.Append(i, fmt.Appendf(nil, "entry-%d", i))
		assert.NoError(t, err)
	}
}

will panic with:

panic: runtime error: slice bounds out of range [1030:1024] [recovered]
	panic: runtime error: slice bounds out of range [1030:1024]

goroutine 8 [running]:
testing.tRunner.func1.2({0x105424720, 0x14000034930})
	/Users/bytedance/.gvm/gos/go1.23.5/src/testing/testing.go:1632 +0x3c8
testing.tRunner.func1()
	/Users/bytedance/.gvm/gos/go1.23.5/src/testing/testing.go:1635 +0x6f8
panic({0x105424720?, 0x14000034930?})
	/Users/bytedance/.gvm/gos/go1.23.5/src/runtime/panic.go:785 +0x124
github.com/streamnative/oxia/server/wal/codec.(*V2).WriteRecord(0x1059de920, {0x105dfc000, 0x400, 0x400}, 0x406, 0x4c6ae8db, {0x14000292560, 0x8, 0x8})
	/Users/bytedance/workspace/github.com/streamnative/oxia/server/wal/codec/v2.go:145 +0x548
github.com/streamnative/oxia/server/wal.(*readWriteSegment).Append(0x140001ec160, 0x34, {0x14000292560, 0x8, 0x8})
	/Users/bytedance/workspace/github.com/streamnative/oxia/server/wal/wal_rw_segment.go:163 +0x1c8

We should not panic even if the segment cann't accept entry exceeded it's size.