[native] Hide max depth and buffer when calling `init_empty_merkle_tree`

[JazielGuerrero]

Is your enhancement request related to a problem? Please describe.
When using the method csl_spl_account_compression.init_empty_merkle_tree it will generate the following call in my stub:

    csl_spl_account_compression::src::cpi::init_empty_merkle_tree(
        for_init_empty_merkle_tree,
        30,
        512,
    )?;

Describe the solution you'd like
I'd like the generator to put the values for max depth and buffer, in this case, 30 and 512 respectively within the init_empty_merkle_tree itself. These values cannot be changed because they can break other parts of the code. I wouldn't like another colleague or me to change these values. These values' source of truth must be the CIDL, specifically the capacity attribute.

Describe alternatives you've considered
N/A

Additional context
N/A