[Draft] feat: source add build field

[myml]

为source添加build字段,可以单独构建每个source

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[deepin-bot]

TAG Bot

New tag: 1.5.0-1
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #372

[deepin-bot]

TAG Bot

New tag: 1.5.1-1
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #421

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在LinglongBuilder::buildStageSource函数中，新增了挂载和处理远程source的逻辑，需要确认是否与现有功能兼容。
• SourceFetcher类中增加了对git类型source的版本号的处理，确保版本号的正确性。
• 删除了extractLayer函数的实现，可能影响依赖此函数的功能，需要检查是否有替代实现或此功能是否不再需要。
• 修改了Project::generateBuildScript函数，添加了source的build命令，需要验证新的build命令格式是否正确，并确保与构建系统的集成。

是否建议立即修改:

• 是，需要确保新增的代码与现有功能兼容，并且不会引入新的bug。同时，需要检查是否有必要的错误处理和日志记录机制。