Resolve "Add a proper admire API for clients"

This MR provides the initial implementation for the ADMIRE I/O Scheduler API.

Closes #10

See merge request !8

(cherry picked from commit e45b76a7)

e05935da Add adm_iosched shared library with API headers
122bf2eb Remove deprecated examples
2378300f Update ADM_cancel_transfer()
2c44d3ce Update ADM_transfer_dataset()
94bdb049 Update ADM_set_dataset_information()
8da7a142 Update ADM_set_io_resources()
7a10dac5 Update ADM_get_transfer_priority
db184139 Update ADM_set_transfer_priority()
b0d49571 Update ADM_get_pending_transfers
d3a66fd2 Rename ADM_set_qos_constraints_push() to ADM_set_qos_constraints()
102f5efc Rename ADM_set_qos_constraints_pull() to ADM_get_qos_constraints()
8fcaa2a6 Update ADM_set_qos_constraints()
0be9a3ae Update ADM_get_qos_constraints()
8bc83186 Update ADM_define_data_operation().
49be7b67 Update ADM_connect_data_operation().
db2b3c52 Update ADM_finalize_data_operation()
525893ef Update ADM_link_transfer_to_data_operation()
57c2a1ec Update ADM_get_statistics()
ce24c115 Add ADM_register_job()
2969bb27 Add ADM_update_job()
8a37352c Add ADM_remove_job()
cfc93063 Add ADM_register_adhoc_storage()
68aa9773 Add ADM_update_adhoc_storage()
8285bc73 Add ADM_remove_adhoc_storage()
00647eb1 Add ADM_deploy_adhoc_storage()
94f5f4fa Update .gitlab-ci.yml
93985b02 Enable parallel building in .gitlab-ci.yml

Resolve "Implement stubs for ADMIRE RPCs"

This MR implements basic stubs for the ADMIRE API RPCs for implementation purposes.

Closes #1

See merge request !1

Resolve "Use `file_options` and `genopts` to define the configuration file"

Closes #8

See merge request !6

Resolve "Automatize MARGO_REGISTER"

Closes #5

See merge request !5

Resolve "Support for input/output parameters in RPCs"

Closes #2

See merge request !4

Resolve "Support CI/CMAKE testing"

Closes #3

See merge request !3

Docker image

Solves #4 

The image contains all the dependencies and environment needed to compile scord and run their examples.

See merge request !2