HclParser might fail if you use `if` as property name

What version of OpenRewrite are you using?

Current main = 9e52e9987a45d3310795a9c5834783f9e8b53216

What is the smallest, simplest way to reproduce the problem?

The following test when added to HclParserTest:

    @Test
    void usingIf() {
        rewriteRun(
          hcl(
            """
            resource "not_a_real_one_for_sure" deny {
              if = "a"
            }
            """
          )
        );
    }

fails with:

Caused by: org.openrewrite.hcl.HclParsingException: Syntax error in file.tf at line 2:2 mismatched input 'if' expecting {'null', '}', Identifier}.
	at org.openrewrite.hcl.HclParser$ForwardingErrorListener.syntaxError(HclParser.java:108)
	... 26 more
Caused by: org.antlr.v4.runtime.InputMismatchException
	at org.antlr.v4.runtime.DefaultErrorStrategy.recoverInline(DefaultErrorStrategy.java:485)
	at org.antlr.v4.runtime.Parser.match(Parser.java:208)
	at org.openrewrite.hcl.internal.grammar.HCLParser.blockExpr(HCLParser.java:1111)
	... 21 more

while I think this is a valid HCL source.
Terraform doesn't seem to have a problem with it.

OSS Repro

• https://github.com/Azure/ArtistAnywhere/blob/bb6b98724607a36589469911a7531f4d677b6880/0.Foundation/policy.tf#L33

Start with the reproducer in HclParserTest and trace the syntax error from HclParser.java into the generated HCLParser.java blockExpr path. Run the usingIf test against the shown HCL input; done means the valid property name parses without the reported HclParsingException.