Fix DHT reading timing for SI7021 on ESP32

[erdembey]

Implementation of Benoit Goudy, which is still working on latest esphome.

Based on timing from tasmota sources

What does this implement/fix?

There is still sensor reading problems with existing implementation of SI7021 in dht.
It was solved by @Beungoud but not imported in existing code base.
I've tried with latest esphome and its working as intended.
Sonoff THR320 and THR316 with THS01 Sensor is effected.

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): fixes

This issue is discussed in these issue topics;
4241
4189

Test Environment

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

Example entry for config.yaml:

sensor:
  - platform: dht
    pin: GPIO25
    model: SI7021
    temperature:
      name: "${friendly_name} Temp"
      id: "${name}_temp"
      filters:
        - filter_out: nan
    humidity:
      name: "${friendly_name} Humi"
      id: "${name}_humi"
      filters:
        - filter_out: nan
    update_interval: 5min

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.

[probot-esphome]

Hey there @OttoWinter, mind taking a look at this pull request as it has been labeled with an integration (dht) you are listed as a code owner for? Thanks!
_{^{(message by CodeOwnersMention)}}

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.43%. Comparing base (4d8b5ed) to head (eff6a15).
Report is 424 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #6604      +/-   ##
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- Coverage   53.70%   53.43%   -0.28%     
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  Files          50       50              
  Lines        9408     9537     +129     
  Branches     1654     1685      +31     
==========================================
+ Hits         5053     5096      +43     
- Misses       4056     4130      +74     
- Partials      299      311      +12     

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