Add support for CH32V002/004/005/006/007

[basilhussain]

This change adds support for CH32V002, CH32V004, CH32V005, CH32V006, CH32V007, and CH32M007.

Although I haven't been able to test against actual hardware (not yet found any chips or boards for sale - at least, not in Western marketplaces), I have verified the following:

• Type ID of 0x21 is same as '003, by capturing serial communication of WCHISPTool's '002 ident command.
• Chip IDs verified against list here in WCH HAL code, and also WCHISPTool config file data.
• Option bytes are the same, by comparing reference manual info.

For CH32M007E8R6 and CH32M007E8U6, although they are listed in the '007 datasheet, I could not find out their chip IDs, so haven't added them.

[andelf]

Confirmed via chiplist_CH32V.wcfg file.

Thanks!