[Python] write_dataset how to add and update data

### Describe the usage question you have. Please include as many useful details as possible.

First, save the parquet file, there are 5 pieces of data
```
dataset_name = 'test_update'
df = pd.DataFrame({'one': [-1, 3, 2.5, 2.5, 2.5],
'two': ['foo', 'bar', 'baz','foo','foo'],
'three': [True, False, True,False,False]},
)
table = pa.Table.from_pandas(df)
ds.write_dataset(table, dataset_name,
existing_data_behavior='overwrite_or_ignore',
format="parquet")
```

Then I want to add two new ones, and I want to get a total of 7 results, and the new data is as follows：
```
df = pd.DataFrame({'one': [1, 2],
'two': ['foo-insert1','foo-insert2'],
'three': [True, False]},
)

table = pa.Table.from_pandas(df)
ds.write_dataset(table, dataset_name,
# existing_data_behavior='delete_matching',
existing_data_behavior='overwrite_or_ignore',
format="parquet")
```
1. **But this overwrites the original, there are only two data, how to achieve new data on the basis of the original**

2. **I have another question, if I want to update the data according to the conditions, how to change how to do it, for example**

> Update one=-1, two=foo's three to False

- python=3.10
- pyarrow=10.0.0

### Component(s)

Parquet, Python

Start with the ds.write_dataset calls in the issue and reproduce them using Python 3.10, PyArrow 10.0.0, and Parquet. Read the write_dataset documentation to determine append and conditional-update behavior; done means providing an authoritative explanation or documentation example for both requested operations.

Written by the indexing model from the issue text.