feat: add USB builk transfer support - #6
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Use bulk endpoints when the device firmware reports BCD version 0x0201 or newer. Falls back to control transfers for older firmware. - Add `_write_bulk()` and `_read_bulk()` helpers - Adapt `spi_xfer()`, `gpio_set_all()` and `spi_clk_out()`to use bulk conditionally
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Description
Uses the bulk transfer if the pico firmware supports it.
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