fix: url attribute 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'

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)

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.47%. Comparing base (70ce8cb) to head (9da8314).
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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #672   +/-   ##
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  Coverage   90.47%   90.47%           
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  Files          40       40           
  Lines        3526     3528    +2     
=======================================
+ Hits         3190     3192    +2     
  Misses        336      336           

Flag	Coverage Δ
	90.47% <100.00%> (+0.29%)	⬆️

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[bednar]

@VitalyChait, thank you for your PR! 👍

Could you please add tests to cover your changes? This will ensure that your additions work as intended and maintain the integrity of the project.

[bednar]

LGTM 🚀