Add basic support for simpler ESC/POS printers (e.g. Gertec)

[taylorlacort]

Context

This fork aims to extend the ESCPOS-ThermalPrinter-Android library to better support
simpler ESC/POS thermal printers, such as Gertec models, which have limited command
support compared to more advanced printers.

Some ESC/POS commands currently used by the library are not fully supported by these
printers, causing printing failures or unexpected behavior.

Goal

Provide a more compatible printing flow for basic ESC/POS printers by:

• Reducing dependency on advanced or non-standard ESC/POS commands
• Allowing simpler command sequences (text, alignment, line feed, cut when available)
• Making the library more tolerant to printers with limited ESC/POS implementations

Scope (initial)

• Focus on basic text printing
• Improve compatibility with printers like Gertec
• Avoid changes that may break existing supported printers
• Adjust command usage only where necessary

Out of scope (for now)

• Image optimization
• QRCode / Barcode improvements
• Bluetooth/Wi-Fi connection changes
• Printer-specific SDK integrations

Acceptance criteria

• Basic text printing works reliably on simpler ESC/POS printers
• No regressions for currently supported printers
• Changes are isolated and documented

Notes

This issue will be used as a reference for incremental commits related to ESC/POS
compatibility improvements.