Dask interface: Accept and forward the new `if-exists` query parameter

About

The new if-exists query parameter will be forwarded to Dask's to_sql() method. By default, influxio will use fail.

Details

When targeting the SQLAlchemy database interface, the target table will be created automatically, if it does not exist. The if-exists URL query parameter can be used to configure this behavior. The default value is fail.

fail: Raise a ValueError.
replace: Drop the table before inserting new values.
append: Insert new values to the existing table.

Example usage

influxio copy \
    "http://example:token@localhost:8086/testdrive/demo" \
    "crate://crate@localhost:4200/testdrive?table=demo&if-exists=replace"

References

https://github.com/crate-workbench/cratedb-toolkit/issues/148

Codecov Report

Attention: Patch coverage is 55.55556% with 4 lines in your changes missing coverage. Please review.

Project coverage is 80.06%. Comparing base (fe3281e) to head (5967722).

Files	Patch %	Lines
influxio/adapter.py	50.00%	4 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #129 +/- ## ========================================== + Coverage 79.62% 80.06% +0.43% ========================================== Files 12 12 Lines 638 642 +4 ========================================== + Hits 508 514 +6 + Misses 130 128 -2 ``` | [Flag](https://app.codecov.io/gh/daq-tools/influxio/pull/129/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=daq-tools) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/daq-tools/influxio/pull/129/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=daq-tools) | `80.06% <55.55%> (+0.43%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=daq-tools#carryforward-flags-in-the-pull-request-comment) to find out more.

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daq-tools / influxio