implement Base8 encoding, rename Binary and Hex encodings

src/commonMain/kotlin/com/infendro/encoding/Base8.kt

@@ -0,0 +1,15 @@
+package com.infendro.encoding
+
+object Base8 : Encoding() {
+    private val CHARACTERS = ubyteArrayOf(
+        0x30U, 0x31U, 0x32U, 0x33U, 0x34U, 0x35U, 0x36U, 0x37U,
+    )
+
+    override fun encode(
+        bytes: UByteArray,
+    ) = encode(bytes, CHARACTERS)
+
+    override fun decode(
+        bytes: UByteArray,
+    ) = decode(bytes, CHARACTERS)
+}