Add tumour staging systems

[hknahal]

At the request of MOH, add the following tumour staging systems: SEER summary staging system: https://training.seer.cancer.gov/staging/systems/summary/

INRGSS staging system: (https://inrgdb.org/neuroblastoma-information/staging-system/) and https://www.cancer.org/cancer/neuroblastoma/detection-diagnosis-staging/staging.html Stage L1 Stage L2 Stage M Stage Ms

INSS: https://www.cancer.org/cancer/neuroblastoma/detection-diagnosis-staging/staging.html Stage 1 Stage 2A Stage 2B Stage 3 Stage 4 Stage 4S

IRSG: https://www.cancer.net/cancer-types/rhabdomyosarcoma-childhood/stages-and-groups Clinical Groups: Group I Group II Group III Group IV

TNM Stages Stage 1 Stage 2 Stage 3 Stage 4

IASLC staging system: Stage groups covered in stage_group terminology already (https://www.jto.org/article/S1556-0864(15)00017-9/pdf)

[hknahal]

Need more information: CIM-O staging system: COG-STS staging system: clinical group? (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4008325/)