Escape curly braces

[windupbird144]

Addresses #1 - This commit allows using double curly braces to log {{ single braces { in the function call syntax.

logger.debug("This logs {{single}} curly braces.");

This logs {single} curly braces.

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[dahlia]

Thanks for your contribution!

Could you add an entry for this change in the CHANGES.md?

[dahlia]

Could you add a test for unpaired curly bracket?

assertEquals(
  parseMessageTemplate("Hello, {{world!", { foo: 123 }),
  ["Hello, {world!"],
);

[windupbird144]

Thanks for your review. I added the test and entry in the changelog file. Unpaired single curly brackets are not handled in this commit, as they aren't handled in the current implementation either.

[dahlia]

Thanks!