Remove pistache dependency cpr

• HTTP Client: Replace Pistache header by CPR header
• Update UPF-related IEs
• Add NRF models
• Related MRs: oai-cn5g-upf!37 (merged), oai-cn5g-nrf!68 (merged)

changed milestone to %v2.1.0 Release

added v2.1 label

requested review from @phine_stefan

assigned to @tien-thinh.nguyen

changed the description

added 1 commit

• e3e8be82 - Fix dnai_list

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added 17 commits

• e3e8be82...04057f7c - 16 commits from branch develop
• 2180d93c - Merge branch 'develop' into remove_pistache_dependency_cpr

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mentioned in commit 42731ce0

merged