…mespace

A lot of third party dependencies (e.g.
matplotlib/matplotlib#25244) are still using
it. Helpful to ignore for now.

BREAKING CHANGE: `ibis.sequence()` is removed

BREAKING CHANGE: `Schema.merge()` is removed, use the union operator `schema1 | schema2` instead

…ummary()` expression methods

BREAKING CHANGE: `Value.summary()` and `NumericValue.summary()` are removed

…_database()` and `.exists_table()` methods

removed from all the backends

BREAKING CHANGE: `Backend.load_data()`, `Backend.exists_database()` and `Backend.exists_table()` are removed

This change was required to prevent import cycles. The value expression
corresponding to a datatype is now can be retrieved using
`getattr(ibis.expr.types, DataType.scalar|column)`.

BREAKING CHANGE: `DataType.scalar` and `column` class attributes are now strings.

…()` methods

BREAKING CHANGE: removed `Table.sort_by()` and `Table.groupby()`, use `.order_by()` and `.group_by()` respectively

…nect()`

it affects the `sqlite` and `duckdb` backends

BREAKING CHANGE: `path` argument of `Backend.connect()` is removed, use the `database` argument instead

BREAKING CHANGE: Inferred types of Python objects may be slightly different. Ibis now use `pyarrow` to infer the column types of pandas DataFrame and other types.

BREAKING CHANGE: `IntervalType.unit` is now an enum instead of a string

BREAKING CHANGE: the `suffixes` argument in all join methods has been removed in favor of `lname`/`rname` args. The default renaming scheme for duplicate columns has also changed. To get the exact same behavior as before, pass in `lname="{name}_x", rname="{name}_y"`.

BREAKING CHANGE: `Table.set_column()` is removed; use `Table.mutate(name=expr)` instead

We had a contributor run into issues with a very old version of
`prompt_toolkit` (3.0.4, ~3 years old) in the conda-lock files cause
trouble.

This bumps the lower bound of `ipython` (which is the package that pulls
in `prompt_toolkit`) so that we get a less-old version.

I don't think this counts as a breaking change in that it only impacts
dev dependencies.

…meunit/dateunit/intervalunit enums

A few missing ops to help clean up some of our TPC-H queries.

Related to #5993

… lz4

BREAKING CHANGE: New environments will have a different default setting for `compression` in the ClickHouse backend due to removal of optional dependencies. Ibis is still capable of using the optional dependencies but doesn't include them by default. Install `clickhouse-cityhash` and `lz4` to preserve the previous behavior.

…ect`