hande single quotes when isLenient=true

[lisonge]

Describe the bug

To Reproduce

package li.songe.gkd

import kotlinx.serialization.json.Json
import org.junit.Test

class ExampleUnitTest {
    @Test
    fun check() {
        val json = Json {
            isLenient = true
        }

        val okStr = """
            {
              a: ['a']
            }
        """.trimIndent()
        println(json.parseToJsonElement(okStr))

        val errStr = """
            {
              a: ['[']
            }
        """.trimIndent()
        println(json.parseToJsonElement(errStr))
    }
}

Expected behavior
parse success

Actual behavior

{"a":['a']}

Unexpected JSON token at offset 10: Expected end of the array or comma at path: $
JSON input: {
  a: ['[']
}
kotlinx.serialization.json.internal.JsonDecodingException: Unexpected JSON token at offset 10: Expected end of the array or comma at path: $
JSON input: {
  a: ['[']
}

Environment

• Kotlin version: [2.0.10]
• Library version: [1.7.1]
• Kotlin platforms: [JVM]
• Gradle version: [8.9]

[lisonge]

my config file string is json5 format

i find #797 is closed, but it doesn't support json5

[lisonge]

The following string also causes parsing errors

{
    a: ['"a']
}

---

and

{
    a: 'a'
}

will got 'a'(length=3) instead of a(length=1)

This isLenient=true mode is not quite what I expected

In JSON5 parsing, single quotes should create an independent string context rather than being meaningless tokens

[lisonge]

https://github.com/lisonge/kotlin-json5