fix: add url object type validation

[VitalyChait]

fix: added type validation to an attribute in client object

Proposed Changes

It is possible to pass "None" by mistake to the InfluxDBClient object.
I propose to do a quick sanity check on it.

Traceback example:
client_obj = InfluxDBClient(url=url, token=token, org=org)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "vitaly.chait/.local/lib/python3.12/site-packages/influxdb_client/client/influxdb_client.py", line 63, in init
super().init(url=url, token=token, debug=debug, timeout=timeout, enable_gzip=enable_gzip, org=org,
File "vitaly.chait/.local/lib/python3.12/site-packages/influxdb_client/client/_base.py", line 56, in init
if self.url.endswith("/"):
^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'endswith'
Exception ignored in: <function InfluxDBClient.del at 0x7ff5627789a0>
Traceback (most recent call last):
File "vitaly.chait/.local/lib/python3.12/site-packages/influxdb_client/client/influxdb_client.py", line 319, in del
if self.api_client:
^^^^^^^^^^^^^^^
AttributeError: 'InfluxDBClient' object has no attribute 'api_client'

Briefly describe your proposed changes:

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• pytest tests completes successfully
• Commit messages are conventional
• Sign CLA (if not already signed)

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 90.44%. Comparing base (70ce8cb) to head (f4f3cec).

Files with missing lines	Patch %	Lines
influxdb_client/client/_base.py	50.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #670      +/-   ##
==========================================
- Coverage   90.47%   90.44%   -0.03%     
==========================================
  Files          40       40              
  Lines        3526     3528       +2     
==========================================
+ Hits         3190     3191       +1     
- Misses        336      337       +1     

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[bednar]

@VitalyChait thanks for your PR 👍

Please satisfy our Checklist: