Add helper functions to convert ASCII bytes to EBCDIC and vice versa

[MohamedSabthar]

Description:
Add following helper methods to convert ASCII bytes to EBCDIC bytes and vice versa in copybook module

# Converts a byte array encoded in EBCDIC to a byte array encoded in ASCII.
#
# + ebcdic - The input byte array encoded in EBCDIC
# + return - The output byte array encoded in ASCII
public function toAsciiBytes(byte[] ebcdic) returns byte[] {
    // ...
}

# Converts a byte array encoded in ASCII to a byte array encoded in EBCDIC.
#
# + ascii - The input byte array encoded in ASCII
# + return - The output byte array encoded in EBCDIC
public function toEbcdicBytes(byte[] ascii) returns byte[] {
    // ...
}

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