rename set_raw_touch_position_ to add_raw_touch_position_

[nielsnl68]

What does this implement/fix?

I was not happy with my chosen method name for adding touches to the touch list.

So this PR will rename:

set_raw_touch_position_(); to add_raw_touch_position_();

This is only important for touchscreen driver developers.

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

Test Environment

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

Checklist:

• The code change is tested and works locally.

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[probot-esphome]

Hey there @jesserockz, mind taking a look at this pull request as it has been labeled with an integration (touchscreen) you are listed as a code owner for? Thanks!
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