transpile ccxt to julia

[defnlnotme]

In order to replace python bindings (required for ccxt) julia transpilation has to be added to ccxt. ccxt/ccxt#15852

I have added julia support to the ccxt ast-transpiler package (still not 100% bug free and feature complete since it must be checked in tandem with what's required by the full transpilation.

left to do:

• write the actual transpiler script in the ccxt repo (similar to e.g. transpileGo.ts)
• aux methods like (fetch/datetime-related/crypto signature-related/) in the native language, Julia in this case (this is the task that will take more time)
• implement the implicit api methods, that you can find inside abstract, that is done in build/generateImplicitAPI.ts
• check the best way of transpiling the tests and implement the entry file in the native language (we have to make sure that both the static/offline tests and the live tests work), only test.init.ts/test_init.py/etc is not, since it is the "entry point" (and tests_helpers.py, in case of python)