[Improvement]: Combine redundant compiler diagnostic error codes

[RadCod3]

Description

Currently error codes that represent missing tokens and keywords have separate error codes for every single token and keyword. All of these follow a simple pattern that can be represented by a few generic messages instead.
Eg. missing $MISSING_TOKEN token or missing $MISSING_KEYWORD keyword.

Describe your problem(s)

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Describe your solution(s)

Current approach is as below,

DiagnosticErrorCode.java

ERROR_MISSING_SEMICOLON_TOKEN("BCE0002", "error.missing.semicolon.token"),
ERROR_MISSING_COLON_TOKEN("BCE0003", "error.missing.colon.token"),
ERROR_MISSING_OPEN_PAREN_TOKEN("BCE0004", "error.missing.open.paren.token"),
...
ERROR_MISSING_PARAMETER_KEYWORD("BCE0210", "error.missing.parameter.keyword"),
ERROR_MISSING_RETURNS_KEYWORD("BCE0211", "error.missing.returns.keyword"),
ERROR_MISSING_RETURN_KEYWORD("BCE0212", "error.missing.return.keyword"),

syntax_diagnostic_message.properties

error.missing.semicolon.token=missing semicolon token
error.missing.colon.token=missing colon token
error.missing.open.paren.token=missing open parenthesis token
...
error.missing.parameter.keyword=missing parameter keyword
error.missing.returns.keyword=missing returns keyword
error.missing.return.keyword=missing return keyword

These can instead be replaced with something like,

ERROR_MISSING_TOKEN("BCE0001", "error.missing.token"),
ERROR_MISSING_KEYWORD("BCE0200", "error.missing.keyword"),

and

error.missing.token=missing ''{0}'' token
error.missing.keyword=missing ''{0}'' keyword

This is the approach used for invalid tokens where BCE0600 represents all invalid tokens and uses the generic message invalid token ''{0}'' for representing the error message.

Related area

-> Compilation

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