[PATCH v2] MdeModulePkg/RegularExpressionDxe: Make oniguruma a submodule in edk2.

Zhang, Shenglei

Use submodule way to access oniguruma. And upgrade oniguruma
version from v6.9.3 to v6.9.4_mark1.
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2073

Cc: Jian J Wang <jian.j.wang@...>
Cc: Hao A Wu <hao.a.wu@...>
Cc: Liming Gao <liming.gao@...>
Signed-off-by: Shenglei Zhang <shenglei.zhang@...>

v2:1.Update the inf file to make VS2019 build pass.
2.Add ignore files in MdeModulePkg.ci.yaml.

The patch is too big, so I put the change on my forked tree.


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