Update `FIELDS` argument to block type for HFE commands schema (#13339)
I reviewed `XREAD` command syntax:
```
XREAD [COUNT count] [BLOCK milliseconds] STREAMS key [key ...] id [id ...]
```
Here’s the structure for `XREAD`:
```json
"arguments": [
{
"token": "COUNT",
"name": "count",
"type": "integer",
"optional": true
},
{
"token": "BLOCK",
"name": "milliseconds",
"type": "integer",
"optional": true
},
{
"name": "streams",
"token": "STREAMS",
"type": "block",
"arguments": [
{
"name": "key",
"type": "key",
"key_spec_index": 0,
"multiple": true
},
{
"name": "ID",
"type": "string",
"multiple": true
}
]
}
]
```
Now, consider the `HEXPIRE` syntax:
```
HEXPIRE key seconds [NX | XX | GT | LT] FIELDS numfields field [field ...]
```
Since the `FIELDS` token functions similarly to `STREAMS`, and given that `STREAMS` is defined as a block, I believe the `FIELDS` in `hepxire` should also be defined as a block.
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