cql2-json between operator fails

I see in the specs that `between` operator accepts 3 args: property, lower limit, and upper limit.
But pygeofilter cql2_json parser expects two args: property and a list of two values indicating the lower and upper limits.

Here's the example from OGC Specs (https://docs.ogc.org/DRAFTS/21-065.html#advanced-comparison-operators), which fails with pygeofilter:

```json
{
"op": "between",
"args": [
{ "property": "depth" },
100.0,
150.0
]
}
```

pygeofilter expects it to be like this:

```json
{
"op": "between",
"args": [
{ "property": "depth" },
[100.0, 150.0]
]
```

Is this due to changes in specs?
It seems like a straightforward fix here: https://github.com/geopython/pygeofilter/blob/main/pygeofilter/parsers/cql2_json/parser.py#L131.
If it's an actual bug, I can submit a PR.

Start in pygeofilter/parsers/cql2_json/parser.py around line 131 and compare its argument handling with the three-argument OGC example in the issue. The work is done when the supplied JSON form with separate lower and upper values is accepted without breaking the existing parser behavior.

Written by the indexing model from the issue text.