bump: update backstage dependencies to 1.4.5

changes:

• bump backstage to 1.4.5, d6fa32c and thanks to @abogdanov37 #8

fix: update removed 'read' calls

changes:

• fix: replace UrlReaderService.read with UrlReaderService.readUrl call, bump @backstage/backend-common to 0.19.0 (backstage/backstage#13820). thanks to @ballpointcarrot #5

minor changes:

• update readme. thanks to @NishkarshRaj #5

Support handling TLS certificate upload and making TLS requests

resolves zalopay-oss/backstage-grpc-playground#1

• developer can choose to store certificate files with encoded content
  to memory or database for recovery purpose
  • for secretKey and initVector: I suggest generate one at
    http://www.unit-conversion.info/texttools/random-string-generator/
    for 32-char and 16-char strings with allowedChars:
    abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789=-+/
• if for any reason that some files of a certificate are missing, we will
  return an array "missingCerts" for client to process

v0.1.3b

fix: can not install protoc and protoc-gen-doc
fix: error handling for unary call