CMake: Build without vcpkg dependencies

[nishanthkarthik]

CMake can now build using system libraries instead of depending on vcpkg. I'll try adding a github workflow for cmake builds in a later PR.

Tested with my system dependencies

cmake

-- Found PkgConfig: /usr/bin/pkg-config (found version "2.5.1")
-- Found SQLite3: /usr/lib/libsqlite3.so (found version "3.53.3")
-- Found BZip2: /usr/lib/libbz2.so (found version "1.0.8")
-- Looking for BZ2_bzCompressInit
-- Looking for BZ2_bzCompressInit - found
-- Found LibArchive: /usr/lib/libarchive.so (found version "3.8.8")
-- Found ZLIB: /usr/lib/libz.so (found version "1.3.2")
-- Checking for one of the modules 'libpcre2-8;libpcre2-16;libpcre2-32;libpcre2-posix'
-- Found CURL: /usr/lib/libcurl.so (found version "8.21.0")
-- Found Unistring: /usr/lib/libunistring.so

ldd

lnav (interpreter => /lib64/ld-linux-x86-64.so.2)
    libcurl.so.4 => /usr/lib/libcurl.so.4
        ...
    libsqlite3.so.0 => /usr/lib/libsqlite3.so.0
    libbz2.so.1.0 => /usr/lib/libbz2.so.1.0
    libpcre2-8.so.0 => /usr/lib/libpcre2-8.so.0
    libarchive.so.13 => /usr/lib/libarchive.so.13
        libacl.so.1 => /usr/lib/libacl.so.1
        liblz4.so.1 => /usr/lib/liblz4.so.1
        liblzma.so.5 => /usr/lib/liblzma.so.5
        libxml2.so.16 => /usr/lib/libxml2.so.16
            libicuuc.so.78 => /usr/lib/libicuuc.so.78
                libicudata.so.78 => /usr/lib/libicudata.so.78
    libz.so.1 => /usr/lib/libz.so.1
    libunistring.so.5 => /usr/lib/libunistring.so.5
    libstdc++.so.6 => /usr/lib/libstdc++.so.6
    libm.so.6 => /usr/lib/libm.so.6
    libgcc_s.so.1 => /usr/lib/libgcc_s.so.1
    libc.so.6 => /usr/lib/libc.so.6
    ld-linux-x86-64.so.2 => /lib64/ld-linux-x86-64.so.2