Tuya Fan component fix to handle enum datapoint type

[sibowler]

What does this implement/fix?

Fixes the existing Tuya Fan Oscillation feature to work with ENUM data points (in addition to BOOL/INTEGER). The current implementation gives an error whenever attempting to set the datapoint when an ENUM type.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other

Related issue or feature (if applicable): N/A - didn't raise issue.

Pull request in esphome-docs with documentation (if applicable): N/A - no changes to documentation

Test Environment

• ESP32
• ESP32 IDF
• ESP8266
• RP2040
• BK72xx
• RTL87xx

Example entry for config.yaml:

# Example config.yaml
fan:
  - platform: tuya
    name: "Fan"
    switch_datapoint: 1
    speed_datapoint: 3
    direction_datapoint: 8
    oscillation_datapoint: 2
    speed_count: 6

Checklist:

• The code change is tested and works locally.
• Tests have been added to verify that the new code works (under tests/ folder).

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in esphome-docs.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (25ab6f0) 53.70% compared to head (6ade924) 53.70%.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #6135   +/-   ##
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  Coverage   53.70%   53.70%           
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  Files          50       50           
  Lines        9403     9403           
  Branches     1653     1653           
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  Hits         5050     5050           
  Misses       4055     4055           
  Partials      298      298           

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