Vendor openr IDL + NetworkUtil, OSS build fixes

Summary:
Vendors a minimal openr slice into `public_tld/openr/` so the OSS build can drop the `openr` getdeps dependency entirely. Carries forward magic_enum, fmt, and other OSS build fixes. Does NOT include `#ifndef IS_OSS` gates for hiding `NetlinkWrapper` — that is handled architecturally by D105648380 (augmentation pattern moving `NetlinkWrapper` into `BgpServiceBB`).

**Vendored openr files** (`public_tld/openr/`, see `PROVENANCE.md` for full notes and removal trigger):
- `if/Network.thrift` — verbatim copy
- `if/Platform.thrift` — copy with two adaptations: removed `include "fb303/thrift/fb303_core.thrift"` and the `extends fb303_core.BaseService` clause on `FibService`. BGP++ uses `FibService` only as a client and never calls `BaseService` methods.
- `common/NetworkUtil.{h,cpp}` — copy with adaptations: removed unused `Constants.h`, `OpenrCtrl_types.h`, `Types_types.h` includes; replaced `throw thrift::OpenrError(...)` with `throw std::runtime_error(...)`.
- `monitor/SystemMetrics.{h,cpp}` — pre-existing vendor (untouched here).

**`public_tld/CMakeLists.txt` changes:**
- Dropped `find_path(OPENR_INCLUDE_DIR ...)` and the four `find_library(OPENR_*)` calls.
- Added `add_fbthrift_cpp_library` for vendored `Network.thrift` and `Platform.thrift` (mirroring the D104704212 fb303 pattern).
- Added `add_library(openr_networkutil openr/common/NetworkUtil.cpp)`.
- Updated `set(OPENR_LIBS ...)` to point to the new local targets — all existing `${OPENR_LIBS}` references in `bgp_common`, `bgp_nexthop`, `bgp_rib`, `bgp_adjrib`, `bgp_peer`, `bgp_service` continue to work.
- Removed `NetlinkWrapper.cpp` from `add_library(bgp_nexthop)` source list (it pulls unvendored `openr/messaging` + `openr/nl`).
- Updated `install(DIRECTORY ... PATTERN "*.h")` to exclude `facebook`, `RibBB.h`, and `NetlinkWrapper.h` (the header pulls unvendored openr symbols).

**Other OSS build fixes:**
- `cpp/lib/fibers/FiberBgpPeerManager.cpp`: wrap fmt enum-format sites with `magic_enum::enum_name()`.
- `cpp/policy/PolicyMatch.cpp`: add `<fmt/format.h>` and `<fmt/ranges.h>`.
- `cpp/policy/PolicyAction.cpp`, `PolicyTerm.cpp`: wrap fmt enum-format sites with `magic_enum::enum_name()`.
- `cpp/policy/base/PolicyMatchBase.h`: drop `noexcept` from virtual `Match` (function throws `std::bad_function_call`; newer Clang flags as `-Werror=exceptions`).
- `public_tld/configerator/structs/neteng/fboss/thrift/common.thrift`: local mirror needed because FBOSS does not install its generated `common_types.h` (same fb303 pattern as D104704212).
- `public_tld/configerator/structs/neteng/fboss/bgp/bgp_config.thrift`: add `enhanced_route_refresh` and `route_refresh` fields with the same field IDs as the internal copy for wire compatibility.
- `manifests/bgp`: keeps `magic_enum`, drops `openr` (no longer needed since the IDL and `NetworkUtil` are vendored).
- `cpp/policy/BUCK`, `cpp/lib/BUCK`: include updates surfaced by autodeps.

**Removal trigger:** The vendored `openr/` slice can be deleted once the Phase 2 refactor of `NexthopInfoBase`/`NexthopStatus`/`Utils` to BGP++-private thrift types lands — at which point the entire `public_tld/openr/` tree (except `monitor/`) goes away and the openr getdeps dep is removed permanently.

Reviewed By: xiangxu1121

Differential Revision: D106128986

fbshipit-source-id: 0cdef66679e18d89e555dfd311daeafe8e67930f

Author: induvsuresh

build/fbcode_builder/manifests/bgp

@@ -20,6 +20,7 @@ fb303
 fboss
 fbthrift
 folly
+magic_enum
 re2
 
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