Opt-in to uploading profiles from why.log() (#1571)

## Description

Separates the notion of authentication mode (authenticated, anonymous,
local) from whether or not `why.log()` should automatically upload
profiles.

## Changes

- Makes `allow_local` default to `True`
- Adds `upload_on_log` configuration parameter orthogonal to session
type (aka authentication mode)
- Prompts for `upload_on_log` in interactive sessions
- `WhyLabsWriter::write()` will warn about possible redundant uploads if
called in a session with `update_on_log` enabled

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Closes whlabs/whylogs#1570


- [ ] I have reviewed the [Guidelines for Contributing](CONTRIBUTING.md)
and the [Code of Conduct](CODE_OF_CONDUCT.md).

python/examples/basic/Getting_Started_with_UDFs.ipynb

@@ -49,7 +49,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "%pip install whylogs"
+    "%pip install 'whylogs>=1.5.0'"
    ]
   },
   {
@@ -133,7 +133,7 @@
    "source": [
     "import whylogs as why\n",
     "\n",
-    "why.init()\n",
+    "why.init(force_local=True)\n",
     "\n",
     "results = why.log(df, name=\"udf_demo\", schema=custom_schema)\n",
     "results.view().to_pandas()"